America’s petroleum exploration and production industry began in the mid-19th century when a lumber company sold 105 acres along a creek known for natural oil seeps.
On November 10, 1854, the lumber firm of Brewer, Watson & Company sold a parcel of the company’s land at the junction of the east and west branches of Oil Creek southeast of Titusville, Pennsylvania. (more…)
Arkansas oil wells of the 1920s created boom towns, established the state’s petroleum exploration and production industry, and boosted the career of a young wildcatter named Haroldson Lafayette Hunt.
The first Arkansas well that yielded “sufficient quantities of oil” was the Hunter No. 1 of April 16, 1920, in Ouachita County, according to the Arkansas Geological Survey. Natural gas was discovered a few days later in Union County by Constantine Oil and Refining Company.
Surrounded by 20 acres of woodlands, the Arkansas Museum of Natural Resources in the Smackover oilfield preserves the state’s petroleum history seven miles north of equally historic El Dorado.
A January 1921 well drilled in the same Union County field at El Dorado marked the true beginning of commercial oil production in Arkansas. When the Busey-Armstrong No. 1 well struck oil in 1921, the oilfield discovery soon catapulted the population of El Dorado from 4,000 to 25,000 people. The well, 15 miles north of the Louisiana border, was the state’s first commercial oil well.
“Twenty-two trains a day were soon running in and out of El Dorado,” noted the Arkansas Gazette. An excited state legislature announced plans for a special railway excursion for lawmakers to visit the oil well in Union County.
Meanwhile, Haroldson Lafayette “H.L.” Hunt arrived from Texas with $50. He joined the crowd of lease traders and speculators at the Garrett Hotel, where fortunes were being made — and lost. Hunt launched his start as an independent oil and natural gas producer during the El Dorado drilling boom.
Some locals said it was his expertise at the poker table that earned him enough to afford a one-half acre parcel lease where his Hunt-Pickering No. 1 well produced some oil, but ultimately proved unprofitable.
Hunt persevered, and within four years acquired substantial El Dorado and Smackover oilfield holdings. By 1925, he was a successful 36-year-old oilman with his wife Lyda and three young children living in a three-story El Dorado home. He would significantly add to his oilfield successes a decade later in Kilgore, Texas (learn more in East Texas Oilfield Discovery).
Located on a hill a little over a mile southwest of El Dorado, the derrick was visible from the town, according to historians A.R. and R.B. Buckalew. They write that three “gassers” had been completed in the general vicinity, but did not produce in commercial quantities.
There was no market for natural gas at the time, the authors explained in their 1974 book, The Discovery of Oil in South Arkansas, 1920-1924.
The Garrett Hotel, where H.L. Hunt checked in with 50 borrowed dollars and launched his long career as a successful independent oil producer.
Yet Dr. Samuel T. Busey was convinced “there was oil down there somewhere.”
The authors added, “Among those who gambled their savings with Busey at this time were Wong Hing, also called Charles Louis, a Chinese laundry man, and Ike Felsenthal, whose family had created a community in southeast Union County in earlier years.”
With no oil production nearby, investing in the “wildcat” well was a leap of faith. Chal Daniels, who was overseeing drilling operations for Busey, contributed the hefty sum of $1,000. On January 10, 1921, the well had been drilled to 2,233 feet and reached the Nacatoch Sand. A small crowd of onlookers and the drilling crew — after moving a safe distance away — watched and listened.
“The spectators, among them Dr. Busey, watched with an air of expectancy,” noted the historians. “Drilling had ceased and bailing operations had begun to try to bring in the well. At about 4:30 p.m., as the bailer was being lifted from its sixth trip into the deep hole, a rumble from deep in the well was heard.”
The rumbling grew in intensity, “shaking the derrick and the very ground on which it stood as if an earthquake were passing,” the authors report. “Suddenly, with a deafening roar, ‘a thick black column’ of gas and oil and water shot out of the well,” they added.
The gusher blew through the derrick and “bursts into a black mushroom” cloud against the January sky. The Busey No. 1 well produced 15,000,000 to 35,000,000 cubic feet of gas and from 3,000 to 10,000 barrels of oil and water a day.
Thanks to the El Dorado discovery, the first Arkansas petroleum boom was on. By 1922, there were 900 producing wells in the state.
Civic leaders raised funds to preserve El Dorado’s historic downtown – and add an Oil Heritage Park at 101 East Main Street.
“Three months after the Busey well came in, work was underway on an amusement park located three blocks from the town that would include a swimming pool, picnic grounds, rides and concessions,” noted the Union County Sheriff’s Office. “Culture was not forgotten as an old cotton shed in the center of town near the railroad tracks was converted to an auditorium.”
The 68-square-mile field will lead U.S. oil output in 1925 – with production reaching 70 million barrels. “It was a scene never again to be equaled in El Dorado’s history, nor would the town and its people ever be the same again,” the authors concluded. “Union County’s dream of oil had come true.”
In 2002, El Dorado gathered 40 local artists to paint 55 oil drums donated by the local Murphy Oil Company. Preserving the town’s historic assets, including boom-era buildings, remains a major goal of the local group, Main Street El Dorado, which was the “2009 Great American Main Street Award Winner” of the National Trust Main Street Center.
Prior to the January 1921 El Dorado discovery, the region’s economy relied almost exclusively on the cotton and timber industries “that thrived in the vast virgin forests of southern Arkansas.”
Petroleum wealth helped Smackover, Arkansas, incorporate in 1922.
Six months after the Busey-Armgstrong No. 1, another giant oilfield discovery 12 miles north will bring national attention – and lead to the incorporation of Smackover. A small agricultural and sawmill community with a population of 131, Smackover had been settled by French fur trappers in 1844. They called the area “Sumac-Couvert,” meaning covered with sumac or shumate bushes.
According to historian Don Lambert, by 1908 Sidney Umsted operated a large sawmill and logging venture two miles north of town. He believed that oil lay beneath the surface. “On July 1, 1922, Umsted’s wildcat well (Richardson No. 1) produced a gusher from a depth of 2,066 feet,” Lambert reported.
“Within six months, 1,000 wells had been drilled, with a success rate of ninety-two percent. The little town had increased from a mere ninety to 25,000 and its uncommon name would quickly attain national attention,” added Lambert.
Roughnecks photographed following the July 1, 1922, discovery of the Smackover (Richardson) field in Union County. Courtesy of the Southwest Arkansas Regional Archives.
The oil-producing area of the Smackover field covered more than 25,000 acres. By 1925, it had become the largest-producing oil site in the world. The field will produce 583 million barrels of oil by 2001.
Opened in 1986, the Arkansas Natural Resources Museum educates visitors in the heart of the historic Smackover oilfield. Exhibits explain how the Busey No. 1 well near El Dorado “blew in with a gusty fury” in January 1921.
The museum includes a five-acre Oilfield Park with operating examples of early and modern oil-producing technologies. They can be found one mile south of the once petroleum-rich town of Smackover, which has celebrated its petroleum heritage with an “Oil Town Festival” every June.
Abundant natural gas in the Fayetteville shale formation brought more drilling to Arkansas.
With more than 46,800 wells drilled between 1925 and 2023, about one-third of the 75 Arkansas counties have produced oil and or natural gas, reported Mineralsanswers.com in July 2024.
Southern Arkansas also is considered among the most prolific lithium resources of its type in North America, according to ExxonMobil, which in 2023 acquired the rights to 120,000 gross acres of the Smackover formation.
Thanks to advances in drilling technologies combined with hydraulic fracturing, the Fayetteville Shale — a 50-mile-wide formation across central Arkansas — has added vast natural gas reserves while creating a new petroleum boom for the state.
Unlike traditional fields containing hydrocarbons in porous formations, shale holds natural gas in a fine-grained rock or “tight sands.” Until the 1990s, drilling in most shale formations was not considered profitable for production.
Surrounded by 20 acres of lush woodlands, the Arkansas Museum of Natural Resources collects and exhibits southern Arkansas petroleum – along with the history of brine drilling and the salt industry. It also has documented the social and economic histories that accompanied the 1920s oil boom.
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Recommended Reading: The Discovery of Oil in South Arkansas, 1920-1924 (1974); The Three Families of H. L. Hunt
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The American Oil & Gas Historical Society (AOGHS) preserves U.S. petroleum history. Please become an AOGHS annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. © 2025 Bruce A. Wells. All rights reserved.
Citation Information – Article Title: “First Arkansas Oil Wells.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/petroleum-pioneers/arkansas-oil-and-gas-boom-towns. Last Updated: January 3, 2025. Original Published Date: April 21, 2013.
The danger involved in America’s early petroleum industry was revealed when the first commercial well went up in flames just weeks after finding oil in the summer of 1859 — becoming the first oil well fire. More serious infernos would follow as the young industry’s early technologies struggled to keep up.
While the Pennsylvania oil region grew — and wooden derricks multiplied on hillsides — an 1861 deadly explosion and fire at Rouseville added urgency to the industry’s need for inventing safer ways for drilling wells.
A marker was dedicated in 1996 on State Highway 8 near Rouseville by the Pennsylvania Historical and Museum Commission. Henry Rouse’s reputation made him a respected leader in the early oil industry.
On April 17, 1861, a highly pressurized well’s geyser of oil exploded in flames on the Buchanan Farm at Rouseville, killing the well’s owner and more than a dozen bystanders.
Sometimes called “Oil Well Fire Near Titusville” but more accurately, Rouseville, the early oilfield tragedy was overshadowed by the greater tragedy of the Civil War. Fort Sumter fell on April 13, 1861; Henry Rouse’s oil well exploded four days later.
The Little and Merrick well at Oil Creek, drilled by respected teacher and businessman Henry Rouse, unexpectedly had hit a pressurized oil and natural gas geologic formation at a depth of just 320 feet. Given the limited drilling technologies for controlling the pressure, the well’s production of 3,000 barrels of oil per day was out of control.
The Rouse Estate later reported, “A breathless worker ran up to him, telling him to ‘come quickly’ as they’d ‘hit a big one.’ According to the best accounts of the time, the ‘big one’ was the world’s first legitimate oil gusher. As oil spouted from the ground, Henry Rouse and the others stood by wondering how to control the phenomenon.”
Detail from “Burning Oil Well at Night, near Rouseville, Pennsylvania,” a painting by James Hamilton of the 1861 oil well fire that killed Henry Rouse today is in the collection of the Smithsonian American Art Museum, Washington, D.C.
The towering gusher also had attracted people from town; many had become covered with oil. Perhaps ignited by the steam engine’s boiler, the well suddenly erupted into flames that engulfed Rouse, killing him and 18 others and seriously burning many more.
Historian Michael H. Scruggs of Pennsylvania State University found a dramatic account from an eyewitness, who reported:
“One of the victims it would seem had been standing on these barrels near the well when the explosion occurred; for I first discovered him running over them away from the well. He had hardly reached the outer edge of the field of fire when coming to a vacant space in the tier of barrels from which two or three had been taken, he fell into the vacancy, and there uttering heart-rending shrieks, burned to death with scarcely a dozen feet of impassable heated air between him and his friends.”
Henry R. Rouse, 1823-1861.
Scruggs noted the 37-year-old Henry Rouse was dragged from the fire severely burned, and expecting the worst, dictated his Last Will and Testament, “to the men surrounding him as they fed him water spoonful by spoonful.”
Engraved on an 1865 marble monument (re-dedicated to Rouse’s memory during a family reunion in 1993) is this tribute:
Henry R. Rouse was the typical poor boy who grew rich through his own efforts and a little luck. He was in the oil business less than 19 months; he made his fortune from it and lost his life because of it. He died bravely, left his wealth wisely, and today is hardly remembered by posterity. — from the Rouse Estate.
The 1865 Atlas of the Oil Regions of Pennsylvania by Frederick W. Beers described this early petroleum industry tragedy in detail:
It was upon this farm (Buchanan) that the terrible calamity of April 1861, occurred, when several persons lost their lives by the burning of a well. The “BURNING WELL” as it has since been called, had been put down to the depth of three hundred and thirty feet, when a strong vein of gas and oil was struck, causing suspension of operations and ejecting a stream from the well as high as the top of the derrick.
“Atlas of the Oil Regions of Pennsylvania,” published by Frederick W. Beers in 1865.
Large numbers of persons were attracted to the scene, when the gas filling the atmosphere took fire, as is supposed, from a lighted cigar, and a terrible explosion ensued, which was heard for three or four miles. The well continued to burn for upwards of twenty hours destroying the tanks and machinery of several adjacent wells, and several hundred barrels of oil. The scene is represented as terrific beyond comparison.
The well spouted furiously for many hours, and the column of flame extended often two and three hundred feet in height, the valley being shut in, as it were, by a dense and impenetrable canopy of overhanging smoke. Fifteen persons were instantly killed by the explosion of the gas, and thirteen others scarred for life.
Among the persons killed was Mr. Henry R. Rouse, who had then recently become interested in that locality, and after whom Rouseville takes its name. The well continued to flow at the rate of about one thousand barrels per day for a week after the fire, when it suddenly ceased, and has since produced very little oil as a pumping well.
These fires have not been unfrequent, and it is a little remarkable that in every case where wells have been so burned they have never after produced save in very small quantities.
Late 1860s stereograph by William J. Portser showing men and women standing on a storage tank and two men at the top of an oil derrick in Pennsylvania, courtesy Library of Congress.
According to historian Scruggs, the knowledge gained from the 1861 disaster along with other early oilfield accidents brought better exploration and production technologies. The first “Christmas Tree” — an assembly of control valves – was invented by Al Hamills after the 1901 gusher at Spindletop Hill, Texas.
Although the deadly Rouseville well fire caused tragedy and devastation, “the knowledge gained from the well along with other accidents helped pave the way for new and safer ways to drill,” Scruggs wrote in his 2010 article.
“These inventions and precautions have become very important and helpful, especially considering many Pennsylvanians are back on the rigs again, this time drilling for the Marcellus Shale natural gas,” he concluded.
Learn more about another important invention, Harry Cameron’s 1922 blowout preventer in Ending Gushers – BOP.
The tragic Pennsylvania oil well fire was immortalized by Philadelphia artist James Hamilton, a mid-19th century painter whose landscape and maritime works are in collections of the Metropolitan Museum of Art in New York City, the Tate Gallery in London, and the Smithsonian American Art Museum (SAAM) in Washington, D.C.
Acquired by the Smithsonian American Art Museum in 2017, artist James Hamilton’s “Burning Oil Well at Night, near Rouseville, Pennsylvania,” was on display in 2018. Photo by Bruce Wells.
In 2017, the Smithsonian museum acquired Hamilton’s “Burning Oil Well at Night, near Rouseville, Pennsylvania,” circa 1861 (oil on paperboard, 22 inches by 16 1⁄8 inches, currently not on view).
“Rouseville, Pennsylvania, lay within a few miles of Titusville and Pithole City, two of the most famous boom towns in Pennsylvania ’s oil fields,” noted the museum’s 2017 description of the painting.
“From 1859 until after the Civil War, new gushers brought investors, cardsharps, saloons, and speculators into these rural settlements. As quickly as they grew, however, the towns collapsed, often from the effects of fires like the one shown here,” noted the Smithsonian’s description.
Flames shooting from the wellhead are part of the circa 1861 “Burning Oil Well at Night, near Rouseville, Pennsylvania,” by James Hamilton.
“In the 1860s, American industrialist John D. Rockefeller (1839-1937) was in the thick of this oil boom, maneuvering to establish the Standard Oil Company,” the museum’s painting description added. “Rockefeller’s investments in railroads and refineries would make him one of America’s richest men, long after the wildcatters in the Pennsylvania fields had gone bust.”
Famed journalist and Rockefeller antagonist Ida Tarbell lived in Rouseville as a child.
Following the Civil War, with consumers increasingly demanding kerosene for lamps (and soon gasoline for autos), the search for oilfields moved westward. The young petroleum industry also developed safety and accident prevention methods alongside new oilfield firefighting technologies.
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Recommended Reading: Trek of the Oil Finders: A History of Exploration for Petroleum (1975); Atlas of the oil region of Pennsylvania (1984); Cherry Run Valley: Plumer, Pithole, and Oil City, Pennsylvania (2000); Warren County (2015). Your Amazon purchase benefits the American Oil & Gas Historical Society. As an Amazon Associate, AOGHS earns a commission from qualifying purchases.
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The American Oil & Gas Historical Society (AOGHS) preserves U.S. petroleum history. Please become an AOGHS supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. © 2025 Bruce A. Wells. All rights reserved.
Citation Information: Article Title: “Fatal Oil Well Fire of 1861.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/petroleum-pioneers/first-oil-well-fire. Last Updated: April 12, 2025. Original Published Date: April 29, 2013.
On ironing day long before electricity, a row of sad irons could be found in the kitchen where the family’s cast-iron cook stove kept them hot. Three or four of these heavy “sadirons” — from the old English word meaning “solid” — cycled between the stove and a nearby ironing board.
With each sad iron weighing five to nine pounds, smoothing clothes led to an exhausting ironing routine. In 1872, Mary Florence Potts from Ottumwa, Iowa, patented a sad iron design with two pointed ends and a quick-change detachable walnut handle.
The 19-year-old housewife’s invention offered relief from blistered palms and was instantly popular nationwide. Thirty years later, a Civil War veteran brought another innovation to ironing.
John C. Lake, who served in the 16th Ohio Volunteer Infantry Regiment during the Civil War, patented (No. 725,261) a gasoline-fueled “Self-Heating Sad Iron” in April 1903.
Lake’s invention made the family fortune and brought prosperity to Big Prairie, Ohio, where he established the Monitor Sad Iron Company on the Pennsylvania Railroad line. The manufacturing company in Amish country would make petroleum-fueled sad irons for the next 50 years.
The 61-year-old inventor earlier had shared three woodworking tool patents with his father Abraham, but none led to production. Lake’s new gasoline-fired sad iron would bring easier ironing to households without electrical service, which in 1903 meant most of America.
As advertised, “Monitor Self-Heating Sad Irons” did not need the kitchen stove, maintained a steady temperature, and turned on and off with a knob. Two tablespoons of alcohol started the process and charged the reservoir delivery system.
“Save Half the Time, Half the Labor, and All the Worry of Laundry Day,” the ads proclaimed as consumers warmly welcomed the gasoline-fueled sad irons, which sold for $3.50 each.
Monitor Sad Iron Company expanded by licensing an army of sales agents. As the factory in Big Prairie grew, by 1920 the company could proclaim 850,000 in cumulative sales. In the 1930s, Monitor added a new brand (Royal) as Lake’s son Bertus received three patents for improvements.
Antique iron collector Prof. Kevin McCartney knows a lot about Monitor Sad Iron Company and its early competitors like Jubilee and Ideal. A professor of Geology at the University of Maine at Presque Isle, he also serves as director of the Northern Maine Museum of Science.
Since 2013, McCartney has posted more than 50 YouTube videos, “to educate and entertain the avid collector, antique shop owner, pickers and novices alike. Each video is a mini-lesson on a different topic about irons.”
In his Kevin Talks Irons number 54, “Firing up the 1903 Monitor gasoline iron,” he described how consumers preferred Monitor’s gasoline appliance — made with just three durable assemblies — because it was “simple, utilitarian, and economical.”
The Monitor Sad Iron Company’s patented self-heating design became “most common of the early gasoline irons.” Formerly a byproduct of kerosene refining, gasoline also had begun its transformation from “white gas” into an automobile fuel before Anti-Knock Ethyl and other additives added color.
Coleman Lamp Company entered the gasoline-fueled iron business in the 1920s. Based in Wichita, Kansas, Coleman began producing a self-heating iron while securing additional patents in 1940.
Products from Monitor, Coleman, Royal and others competed in catalog offerings and advertisements, especially for potential customers in rural, unelectrified regions. The self-heating appliances burned the basic white gas (naphtha). Coleman later branded and sold the fuel in one-gallon containers as Coleman Fuel.
Coleman Company quit manufacturing gasoline-fueled sad irons after World War II, and the Monitor Sad Iron factory closed in 1954 as electricity relegated most such artifacts to museums and antique shops.
When Mary Florence Potts originally patented her innovative sad iron (today commonly spelled sadiron), she used her name instead of Mrs. Joseph Potts, according to a 2021 “Out of the Attic” article by Julie Martineau of Des Moines County Historical Society (DMCHS).
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The American Oil & Gas Historical Society preserves U.S. petroleum history. Please become an AOGHS annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. Copyright © 2025 Bruce A. Wells.
Citation Information – Article Title: “Ironing with Gasoline.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/oil-almanac/ironing-with-gasoline. Last Updated: April 1, 2025. Original Published Date: November 5, 2022.
As Northwestern Pennsylvania oil production skyrocketed following the Civil War, railroad oil tank cars fabricated by two brothers improved shipment volumes from oilfields to kerosene refineries. The tank car designed by James and Amos Densmore would not last, but more success followed when Amos invented a new keyboard arrangement for typewriters.
Flatbed railroad cars with two wooden oil tank cars became the latest advancement in oilfield infrastructure after the Densmore brothers patented their design on April 10, 1866.
The inventors from Meadville, Pennsylvania, had developed an “Improved Car for Transporting Petroleum” one year earlier in America’s booming oil regions. The first U.S. oil well had been drilled just seven years earlier along Oil Creek in Titusville.
The first practical petroleum railway tank car was invented in 1865 by James and Amos Densmore at the Miller Farm along Oil Creek, Titusville, Pennsylvania. Photo courtesy Drake Well Museum.
Using an Atlantic & Great Western Railroad flatcar, the brothers secured two tanks to ship oil in bulk. The patent (no. 53,794) described and illustrated the railroad car’s design.
The nature of our invention consists in combining two large, light tanks of iron or wood or other material with the platform of a common railway flat freight-car, making them practically part of the car, so as they carry the desired substance in bulk instead of in barrels, casks, or other vessels or packages, as is now universally done on railway cars.
Development of railroad tank cars came when traditional designs, including the flatcar, hopper, and boxcar, proved inadequate for large amounts of oil — often shipped in 42-gallon barrels.
New designs were born out of necessity, as the fledgling oil industry demanded a better car for the movement of its product, according to American-Rails.com.
“Before the car was developed, railroads used a combination of boxcars, flatcars, and gondolas to haul everything from lumber and coal to crude oil, molasses, and water (by use of barrels),” noted Adam Burns in 2022. “One of the most prolific car types you will find moving within a freight train today is the tank car.”
Prone to leaks and top heavy, Densmore tank cars provided a vital service, if only for a few years before single, horizontal tanks replaced them.
According to transportation historian John White Jr., the Densmore brothers’ oil tank design essentially consisted of a flat car with wooden vats attached. “The Central Pacific is known to have used such specialized cars to transport water, he noted in his 1995 book, The American Railroad Freight Car.
“However, prior to the discovery of oil by Colonel Edward (sic) Drake near Titusville, Pennsylvania, on August 27, 1859, the tank car was virtually non-existent,” added White, a former curator of Transportation at the Smithsonian Institution.
The brothers further described the use of special bolts at the top and bottom of their tanks to act as braces and “to prevent any shock or jar to the tank from the swaying of the car while in motion.”
A Pennsylvania Historical Commission marker on U.S. 8 south of Titusville commemorates the Densmore brothers’ significant contribution to petroleum transportation technology. Dedicated in 2004, the marker notes:
The first functional railway oil tank car was invented and constructed in 1865 by James and Amos Densmore at nearby Miller Farm along Oil Creek. It consisted of two wooden tanks placed on a flat railway car; each tank held 40-45 barrels of oil. A successful test shipment was sent in September 1865 to New York City. By 1866, hundreds of tank cars were in use. The Densmore Tank Car revolutionized the bulk transportation of crude oil to market.
The benefit of such railroad cars to the early petroleum industry’s infrastructure was immense, especially as more Americans eagerly sought oil-refined kerosene for lamps.
Despite design limitations that would prove difficult to overcome, independent producers took advantage of the opportunity to transport large amounts of petroleum. Other transportation methods required teamsters hauling barrels to barges on Oil Creek and the Allegheny River to get to kerosene refineries in Pittsburgh.
Riveted cylindrical iron tank cars replaced the Densmore brothers’ dual wooden tanks — seen here discarded. Photo courtesy Drake Well Museum.
As larger refineries were constructed, it was found that it cost $170 less to ship 80 barrels of oil from Titusville to New York in a tank car instead of individual barrels. But the Densmore cars had flaws, notes the Pennsylvania Historical Commission.
They were unstable, top heavy, prone to leaks, and limited in capacity by the eight-foot width of the flatcar. Within a year, oil haulers shifted from the Densmore vertical vats to larger, horizontal riveted iron cylindrical tanks, which also demonstrated greater structural integrity during derailments or collisions.
The same basic cylindrical design for transporting petroleum can be seen as modern railroads load products from corn syrup to chemicals — all in a versatile tank car that got its start in the Pennsylvania oil industry.
The largest tank car ever placed into regular service was Union Tank Car Company’s UTLX 83699, rated at 50,000 gallons in 1963 and used for more than 20 years. A 1965 experimental car built by General American Transportation, the 60,000-gallon “Whale Belly,” GATX 96500, is now on display at the National Museum of Transportation in Saint Louis.
Although the Densmore brothers left the oil region by 1867 — their inventiveness was far from over. In 1875, Amos Densmore assisted Christopher Sholes in rearranging the “type writing machine” keyboard so that commonly used letters no longer collided and got stuck. The “QWERTY” arrangement vastly improved Shole’s original 1868 invention.
Amos Densmore helped invent one of the first practical typewriters.
Following his brother’s work with Sholes, inventor of the first practical typewriter, James Densmore’s oilfield financial success helped the brothers establish the Densmore Typewriter Company, which produced its first model in 1891. Few historians have made the oil patch to typewriter keyboard connection — including Densmore biographers.
The Pennsylvania Historical Commission reported that biographies of the Densmore brothers — and their personal papers at the Milwaukee Public Museum — all refer to their innovative typewriters, “but make no mention of their pioneering accomplishment in railroad tank car design.”
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Recommended Reading: The American Railroad Freight Car (1995); Early Days of Oil: A Pictorial History of the Beginnings of the Industry in Pennsylvania
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The American Oil & Gas Historical Society (AOGHS) preserves U.S. petroleum history. Please become an AOGHS annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. © 2025 Bruce A. Wells. All rights reserved.
Citation Information – Article Title: “Densmore Oil Tank Cars.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/transportation/densmore-oil-tank-car. Last Updated: April 3, 2025. Original Published Date: April 7, 2013.
