by Bruce Wells | Jul 24, 2026 | Petroleum Pioneers
Once called “night riders of the hemlocks,” petroleum sleuths separated oil well fact from fiction.
During the cold winter of 1888, 37-year-old oil scout Justus C. McMullen succumbed to pneumonia contracted while investigating oil production from a well in the wooded hills near Canonsburg, Pennsylvania.
McMullen, publisher of the Bradford “Petroleum Age” newspaper, already had contributed much to America’s early petroleum industry as a journalist and oilfield detective.
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by Bruce Wells | Jul 16, 2026 | Energy Education Resources
Geologist tracks down first references to petroleum.
Petroleum geologist and historian Raymond P. Sorenson spent much of his professional career writing about petroleum exploration and production. After a 30-year career with Anadarko Petroleum, in 2006 he retired to further explore his fascination with the industry’s history.
Among Sorenson’s ongoing projects is documentation of the earliest signs of oil worldwide, including references to hydrocarbons long before the 1859 first U.S. oil well drilled 69.5 feet into the Venango sands of Pennsylvania.
He has since documented the earliest signs of oil worldwide, including references to hydrocarbons long before the 1859 first U.S. oil well drilled 69.5 feet into the Venango sands of Pennsylvania.
About three centuries earlier, a Spanish expedition in the Gulf of Mexico led by Don Luis de Moscoso landed at the mouth of the Sabine River in the future state of Texas. The New World explorers in 1543 discovered Indians had for centuries utilized natural seeps to waterproof canoes, apply to abrasions, and more.
A Spanish expedition in 1543 used brigantines to explore the coast of the Gulf of Mexico.
Sorenson, retired and living in Tulsa, initially focused his research on geological surveys, reports from other exploring expeditions, and scientific journals. He then progressed to references cited by others and concentrated his efforts on North America and English language sources — the most readily available — but discovered rare sources as well.
Oil in Antiquity to Today
The petroleum geologist’s ongoing work has added more than 740 reference pages (with captured images) of his sources for the earliest signs of hydrocarbons in North America and other parts of the world.
In 2002, Sorenson shared with the American Oil & Gas Historical Society his 59-page bibliography of “Pre-Drake” publications. “For the past few years I have been engaged in a systematic study to document what was known about oil and natural gas prior to the Drake well,” he noted.
“I have an additional list of cited references that I have not yet examined of comparable size,” Sorenson added in a follow-up email to AOGHS. “The majority are in languages other than English, and I suspect that many of them will not be accessible through my library resources (or my linguistic skill set).”
A petroleum historian and consulting geologist based in Tulsa, Oklahoma, Sorenson explained in his email to AOGHS that to aid researchers, he has been using images of every page that contains relevant material, posting the full reference information at the top, and outlining the relevant portion of the text.
An 1835 reference to signs of oil and natural gas in Massachusetts prior to the first U.S. oil well in Pennsylvania. Image courtesy Ray Sorenson.
“So far I have found relevant information in more than 550 publications with over 3,500 net pages, covering at last count 31 states, five Canadian provinces, and many foreign countries on other continents,” Sorenson noted in January. “For several topics, I have created subsets. I expect to continue to build the collection.”
In addition to antiquity references, Sorenson’s research for his “Pre-Drake Literature Collections by Subject” has thus far included:
California, Canada, Central & South America, Early Geologists, Europe, Fiction, Humboldt, Industrial & Laboratory, Initial Reactions, Kentucky, Maps & Figures, Medicinal , Middle East Asia Africa, Midwest, New England, New York, Oil & Gas Wells Pre-Drake, Ohio, West Virginia, Pennsylvania, Religious, Scientific American, Shales that Burn, Southern United States, Taylor R.C., Statistics of Coal, Textbooks, Volcanoes and Earthquakes, David Wells, Annual of Scientific Discovery, and Western United States.
Although many of his discoveries were found in obscure scholarly journals, Sorenson also found petroleum references in popular 19th-century publications. For example, the April 18, 1829, issue of “Niles’ Register” reported a Kentucky salt well driller finding oil.
“We have just conversed with a gentleman from Cumberland county, who informs us that in boring through rocks for salt water, a fountain of petroleum, or volatile oil, was struck, at the depth of 180 feet,” the Baltimore publication noted on page 117.
Gigabytes of Research
A long-time member of the American Association of Petroleum Geologists (AAPG) and the Petroleum History Institute (PHI), Sorenson has made many presentations and published academic papers with both. He submitted to PHI a paper on his history of oil and natural gas production from wells prior to 1859 for the journal Oil-Industry History.
The wells were drilled seeking water or brine, but Sorenson found one that flowed an estimated 2,500 barrels of oil per day in the 1820s. Sorenson adapted many of his contributions to AAPG for its extensive Discovery Series with “First Impressions: Petroleum Geology at the Dawn of the North American Oil Industry.”
In January 2013, Sorenson’s “Historic New York Survey Set High Geologic Standards” was published in AAPG Explorer magazine, one of his many contributions to that publication.
Sorenson, who also has assisted with AOGHS articles (see Rocky Beginnings of Petroleum Geology), noted in his email that he has no plans to provide this collection in searchable form on a website but will work with anyone who is conducting similar research.
Everything in the Sorenson collection is preserved in hard copy and digital (PDF) form, adding up to 11 feet of shelf space — about 27 gigabytes of computer memory. Sorenson intends to give his full collection of research to the Drake Well Museum and Park in Titusville, at the site where Edwin L. Drake first found oil in the upper Venango sands.
Today, the Oil Region Alliance of Business, Industry and Tourism proclaims that historic part of northwestern Pennsylvania, “The Valley that Changed the World.”
For more information about Ray Sorenson’s ongoing oil history projects and resources, post a comment below.
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First U.S. Oil Well
The 19th century science of petroleum geology began with a new industry in western Pennsylvania. A well drilled in 1859 by former railroad conductor Edwin L. Drake near Titusville sought oil for refining into kerosene, a new lamp fuel at the time made from coal.
Slowed by delays in receiving funds for what locals called “Drake’s Folly” and drilling with a steam-powered cable-tool rig, it took Drake more than a year to find oil at a depth of 69.5 feet. He also made his own innovations along the way, including adding a 10-foot cast iron pipe to the borehole.
To the relief of company founder George Bissell and investors in the Seneca Oil Company of New Haven, Connecticut, Drake completed the first U.S. oil well drilled specifically for oil. The August 27, 1859, discovery came in a geologic formation that would be called the Venango sands. A few days later, a well drilled nearby became the new petroleum industry’s first dry hole.
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Recommended Reading: Trek of the Oil Finders: A History of Exploration for Petroleum (1975); The Birth of the Oil Industry (1936); The Prize: The Epic Quest for Oil, Money & Power
(2008); Myth, Legend, Reality: Edwin Laurentine Drake and the Early Oil Industry
(2009). 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 support this website, subscribe to the monthly email newsletter, and help expand our historical research. Contact bawells@aoghs.org. Copyright © 2026 Bruce A. Wells.
Citation Information – Article Title: “Sorenson Oil History Project.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/energy-education-resources/exploring-the-earliest-signs-of-oil. Last Updated: July 27, 2026. Original Published Date: August 5, 2020.
by Bruce Wells | Jul 4, 2026 | Petroleum Art
Thousands of glass-negative images document the earliest scenes of America’s petroleum industry.
Soon after the first American oil well in 1859 launched the U.S. petroleum industry in remote northwestern Pennsylvania, an English emigrant began documenting life in the oilfields.
John A. Mather (1829-1915) photographed the people, places and technology from the earliest days of oil exploration. In the fall of 1860, he set up his first studio in Titusville, Pennsylvania — where he would begin to amass more than 20,000 glass-plate negatives.
In 2026, Mather’s work is included with other oilfield photographers in a from May 23 to August 23 exhibit of petroleum-related photography at the National Museum of American Art in Washington, D.C. Among the 150 images in “Beneath the Surface: Mining and American Photography” are scenes from the 19th-century Pennsylvania oil regions, including a stereographic view by Mathers.
The National Gallery of Art’s 2026 exhibit includes a 19th-century oilfield stereograph (with viewer) by John Mather. The 150 images in “Beneath the Surface: Mining and American Photography,” travel to the Amon Carter Museum of American Art in Fort Worth, Texas, in 2027. Photo by Bruce Wells.
“Nearly two centuries of American photographs bear witness to the people and places that power our lives,” the NGA exhibit explains, adding that photographs have “documented mining, drilling, and fracking—industries that often happen underground or out of sight. They reveal how we extract resources from the earth and the impact on people and our planet.”
Oil Creek Artist
The National Gallery of Art also has in its collection Mather’s Historical Oil Region Views of Western Pennsylvania, published in Titusville in 1895.
Titusville and nearby Oil City and Franklin, in the heart of the growing Pennsylvania oil regions (soon joined by the boom town of Pithole), proved ideal locations for documenting the people, events and evolving drilling technologies of petroleum exploration and production.
Iconic but often misidentified 1866 photo by John A. Mather features Edwin L. Drake (in top hat) with friend Peter Wilson standing at the rebuilt derrick and engine house of the 1859 first U.S. commercial oil well. Photo courtesy Drake Well Museum and Park.
What Civil War photographers Matthew Brady and James Gardner documented on battlefields, Mather accomplished in Pennsylvania’s oilfields. In 1866, Titusville’s “Oil Creek Artist” photographed the now iconic image of Edwin L. Drake, standing at the original drilling site (rebuilt after the first oil well fire).
Like Brady, Mather abandoned making one-of-kind daguerreotypes and ambrotypes in favor of wet plate negatives using collodion — a flammable, syrupy mixture also called “nitrocellulose.” With one glass plate, many paper copies of an image could be printed and sold.
Oilfield photographer John Aked Mather, probably a self-portrait circa 1900.
However, unlike most of the era’s studio photographers, Mather transported his camera and chemicals into the industrial chaos of early Pennsylvania oilfields. But like most people in the new oil region, Mather was susceptible to “oil fever;” he hoped to drill some successful wells himself.
Oil Fever
Above all, the oil regions continued to boom. The gamble of drilling for new oilfield discoveries brought excitement. As “oil fever” spread, polka and waltz song sheets like the Petroleum Court Dance became popular.
Having narrowly missed the opportunity for a one-sixteenth share of the Sherman Well, which proved to be the “best single strike of the year,” Mather and three associates invested in oil wells near booming Pithole Creek. He proved to be better at using a camera.
John Mather photographs courtesy Western Pennsylvania Historical Magazine and Drake Well Museum, Titusville. Above, the interior of his Titusville studio, circa 1865.
Mather’s investment in finding oil at Pithole Creek did not lead to producing any commercial quantities. He tried again on the Holmden Farm off West Pithole Creek. His unsuccessful drilling effort proved to be one of the last wells in the infamous boom town Pithole.
Many tried, but few in the increasingly crowded oil regions would rival the wealth of the celebrated “Coal Oil Johnny.” Years later, Mather acknowledged that the excitement of the drilling for “black gold” was so great that he “forsook photography for the oil business.”
Meanwhile, the young U.S. petroleum industry learned some hard lessons. Highly pressurized wells and disasters like the 1861 fatal Rouseville oil well fire brought attention to a new science, petroleum geology.
Detail from the 19th-century stereoview “Oil Regions of Pennsylvania,” published by C. W. Woodward of Rochester, N.Y., featuring John Mather’s floating studio and dark room.
Returning to the oilfields with his camera, Mather’s rolling darkroom and floating studio traveled up and down Oil Creek. In 2008, photographic historian John Craig (1943-2011) noted the discovery of a Mather image in a stereoview card published by C.W. Woodward.
“We have had the card for years and assumed that the boat belonged to Woodward,” the historian noted. “When I made the scan I noticed that the side of the boat carried a sign ‘Oil Creek Artist.’ I Googled and found that the studio/darkroom boat belonged to John A. Mather.”
At its peak, Mather’s collection amounted to more than 16,000 glass negatives. The trade magazine Petroleum Age described his oilfield photography as “so perfect in finish it stands the test of time.”
Oil Creek Flood and Fire
On Sunday morning June 5, 1892, and after weeks of rain, Oil Creek’s overflowing Spartansburg Dam failed at about 2:30 a.m. A wall of water and debris swelled towards Titusville and its oil works, seven miles downstream.
“On rushed the mad waters, tearing away bridge after bridge, carrying away horses, homes and people,” one newspaper reported about the flood’s devastation. Then fire erupted from ruptured benzine and oil storage tanks.
Oilfield workers pose on and among their oil derricks and engine houses in this 1864 John Mather photo from the Drake Well Museum collection in Titusville, Pennsylvania.
Newspapers all over America carried stories of the disaster. In Montana, the Helena Independent headlines included: “Waters of an Overflowing Creek Become a Rushing Mass of Flames” and victims being, “Spared by the Deluge Only to Become the Prey of the Fire.”
John Mather’s photographs documented family life in remote early oil boom towns. He also briefly caught “oil fever” and unsuccessfully invested in a few wells in the booming Pithole Creek field.
The Brooklyn Daily Eagle added: “The Waters Subside and The Flames Die Away, Revealing the Full Extent of the Calamity.” Oil City and Titusville were “Nearly Wiped From Off the Earth.”
Unfortunately, Mather’s studio flooded to a depth of five feet, destroying expensive equipment — and most of his life’s work of prints from glass plate negatives.
Pennsylvania oil towns were “Nearly Wiped From Off the Earth” by an 1892 fire and flood that destroyed thousands of Mather’s prints and glass plates. Photo from Drake Well Museum collection.
As the fires and flood continued, Mather set up his camera and photographed the disaster in progress with his bulky equipment, which already was being rendered obsolete by new imaging technologies.
Photography Legacy
Just a few years before the Titusville flood, George Eastman of Rochester, New York, introduced celluloid roll film and created an entirely new market: amateur snapshot photography.
Expertise in preparing fragile glass plates and dangerous chemicals was no longer required. Instead, Kodak offered, “You Press the Button, We Do the Rest.”
The “Oil Creek Artist” visited potential customers using his floating darkroom.
As oil booms moved to discoveries in other states, including the massive 1901 “Lucas Gusher” in Texas, Mather worked little in his later years. His financial circumstances diminished with age and illness.
The Artist of Oil Creek died poor and without fanfare on August 23, 1915, in Titusville. His death certificate reported the cause as cerebral hemorrhage, “complicated by suppression of urine.”
An 1865 John Mather photograph of wooden derricks, engine houses, oilfield workers, an office (and tree stumps) at Pioneer Run – Oil Creek, Pennsylvania.
To preserve John A. Mather’s petroleum industry legacy, the Drake Well Memorial Association purchased 3,274 surviving glass negatives for about 30 cents each.
The Drake Well Museum has preserved the photographer’s surviving work. The museum and surrounding park allow visitors to explore rare artifacts and a visual record of the early U.S. oil and natural industry. Visit the Titusville museum along Oil Creek and other Pennsylvania petroleum museums.
More Resources
“Virtually unknown, certainly unheralded, and completely unappreciated — in these few words is a description of John Aked Mather, pioneer photographer, ” proclaimed Ernest C. Miller and T.K. Stratton in their January 1972 article, “Oildon’s Photographic Historian,” in The Western Pennsylvania Historical Magazine (Volume 55, Number 1).
Born in Heapford Bury, England, in 1829, the son of an English papermill superintendent, Mather joined his two brothers in America in 1856. He soon became “transfixed by the beauty of the Pennsylvania and Eastern Ohio regions,” explains a NWPaHeritage article, adding he developed an “obsessive desire to capture the industry in its entirety.”
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Recommended Reading: Western Pennsylvania’s Oil Heritage
(2008); Around Titusville, Pa., Images of America
(2004); Cherry Run Valley: Plumer, Pithole, and Oil City, Pennsylvania, Images of America (2000); Myth, Legend, Reality: Edwin Laurentine Drake and the Early Oil Industry
(2009). 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 annual supporter and help maintain this energy education website and expand historical research. For more information, contact bawells@aoghs.org. © 2026 Bruce A. Wells.
Citation Information – Article Title: “Oilfield Photographer John Mather.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/petroleum-art/oilfield-photographer-john-mather. Last Updated: July 16, 2026. Original Published Date: March 11, 2005.
by Bruce Wells | Jul 3, 2026 | Petroleum Art
Some say L. Frank Baum’s 1880s oil business inspired the Tin Man.
The Tin Man in The Wonderful Wizard of Oz can trace his roots to the earliest U.S. oilfields where L. Frank Baum operated a lubricant business before becoming the famous children’s book author. (more…)
by Bruce Wells | Jun 7, 2026 | Petroleum Technology
Oilfield production technologies began in Pennsylvania with an economical way to pump multiple wells.
In the earliest days of the petroleum industry, which began with an 1859 oil discovery in Pennsylvania, production technologies used steam power and a walking beam pump system that evolved into ways for economically producing oil from multiple wells.
Just as drilling technologies evolved from spring poles to steam-powered cable tools to modern rotary rigs, oilfield production also improved.
Inside an oilfield central power house with a circa 1909 double-eccentric wheel manufactured by the Titusville Iron Works, Pennsylvania, used to pump multiple oil wells. Photo courtesy Library of Congress.
In the early days of the industry, oil production technology used steam power and a wooden walking beam. A steam engine at each well raised and lowered one end of the beam. An oil production technique perfected in Pennsylvania used central power for pumping low-production wells to economically recover oil.
Eccentric Wheels
A Library of Congress (LOC) photograph from 1909 shows a “double eccentric power wheel,” part of an innovative centralized power system. The oilfield technology from a South Penn Oil Company (the future Pennzoil) lease between the towns of Warren and Bradford, Pennsylvania.
The LOC photograph preserves the oilfield technology that used the two wheels’ elliptical rotation for simultaneously pumping multiple oil wells. The wheels’ elliptical rotation simultaneously pumped eleven remote wells. This central pump unit operated in the Morris Run oilfield, discovered in 1883. It was manufactured at the Titusville Iron Works.
Many oilfield history resources can be found in the Library of Congress Digital Collections and the related images of petroleum history photography. The development of centralized pumping systems — eccentric wheels and jerk lines — often are preserved in high-resolution files.
The Morris Run field in Pennsylvania produced oil from two shallow “pay sands,” both at depths of less than 1,400 feet. It was part of a series of other early important discoveries.
Oil Well Supply Company illustration of its pumping system for using rods, cables, and a geared, eccentric wheel with elliptical rotation simultaneously pumping remote wells.
In 1881, the Bradford field alone accounted for 83 percent of all the oil produced in the United States (see Mrs. Alford’s Nitro Factory). By the early 2000s, new technologies began producing large amounts of natural gas from a far deeper formation, the Marcellus Shale.
Oil production from some of the earliest shallow Pennsylvania wells declined to only about half a barrel of oil a day, but some continued pumping into 1960. On the West Coast, a 1913 central pumping unit produced from California’s largest oilfield three decades longer.
Midway-Sunset Jack Plant
On June 9, 2023, the National Park Service added the Midway-Sunset Jack Plant to the National Register of Historic Places — thanks to Mark Smith, who submitted the application to preserve the facility. Installed by the Engineers Oil Company in 1913, the Kern County jack plant pumped oil until 1990.
In operation until 1990, California’s Midway-Sunset Jack Plant used eccentric-wheel technologies from the late 19th century. The Kern County plant pumped more than 1.5 million barrels of oil. Photos courtesy John Harte. Illustration courtesy San Joaquin Geological Society.
“The Midway-Sunset Jack Plant is an extremely rare example of central power and ‘jack-line’ oil pumping technology on its original site and housed in its original building,” Smith noted in his 45-page draft application to the State Historical Resources Commission. “Its design and operational history reflect significant advancements in oil extraction technology.”
According to company records, the jack plant’s slowly rotating eccentric wheels produced 1.5 million barrels of oil during its lifetime. The end came when the bearing of the vertical shaft became worn, causing the shaft to wobble. The wobble of the eccentric gears made the pumping of the wells out of balance.
Pumping Multiple Wells
As the number of oil wells grew in the early days of America’s petroleum industry in Pennsylvania, simple water-well pumping technologies began to be replaced with steam-driven walking-beam pumping systems.
At first, each well had an engine house where a steam engine raised and lowered one end of a sturdy wooden beam, which pivoted on the cable-tool well’s “Samson Post.” The walking beam’s other end cranked a long string of sucker rods up and down to pump oil to the surface.
Oilfield technologies evolved in 1875 with this “Improvement In Means For Pumping Wells” invented in Pennsylvania.
Recognizing that pumping multiple wells with a single steam engine would boost efficiency, on April 20, 1875, Albert Nickerson and Levi Streeter of Venango County, Pennsylvania, patented their “Improvement in Means for Pumping Wells.”
Their system was the forerunner of wooden or iron rod jerk line systems for centrally powered oil production. This technology, eventually replaced by counter-balanced pumping units, will operate well into the 20th century – and remain an icon of early oilfield production.
“By an examination of the drawing it will be seen that the walking beam to well No. 1 is lifting or raising fluid from the well. Well No. 3 is also lifting, while at the same time wells 2 and 4 are moving in an opposite direction, or plunging, and vice versa,” the inventors explained in their patent application (No. 162,406).
Central Power Units
“Heretofore it has been necessary to have a separate engine for each well, although often several such engines are supplied with steam from the same boiler,” noted Nickerson and Streeter.
“The object of our invention is to enable the pumping of two or more wells with one engine…By it the walking beams of the different wells are made to move in different directions at the same time, thereby counterbalancing each other, and equalizing the strain upon the engine.”
Allegheny National Forest Oil Heritage Series illustration of a jack plant in McKean County, Pennsylvania.
Steam initially drove many of these central power units, but others were converted to burn natural gas or casing-head gas at the wellhead – often using single-cylinder horizontal engines. Examples of the engines, popularly called “one lungers” by oilfield workers, have been collected and restored (see Coolspring Power Museum).
Many widely used techniques of drilling and pumping oil were developed to recover the high-quality “Pennsylvania Grade” oil. Image courtesy Library of Congress.
The heavy and powerful engine — started by kicking down on one of the iron spokes — transferred power to rotate an eccentric wheel, which alternately pushed and pulled on a system of rods linked to pump jacks at distant oil wells.
Pump Jacks
“Transmitting power hundreds of yards, over and around obstacles, etc., to numerous pump jacks required an ingenious system of reciprocating rods or cables called Central Power and jerker lines,” explains documentation from an Allegheny National Forest Oil Heritage Series.
The series documentation includes an early illustration of an oilfield “jack plant” in McKean County, Pennsylvania. The long rod lines were also called shackle lines or jack lines.
A single engine with eccentric wheel connecting rod lines could economically pump oil using Oil Well Supply Company’s “Simplex Pumping Jacks.”
Around 1913, with electricity not readily available, the Simplex Pumping Jack became a popular offering from Oil Well Supply Company of Oil City, Pennsylvania. The simple and effective technology could often be found at the very end of long jerk lines.
A central power unit could connect and run several of these dispersed Simplex pumps. Those equipped with a double eccentric wheel could power twice as many.
Roger Riddle, a retired field guide for the West Virginia Oil & Gas Museum in Parkersburg, grew up around central power units and recalls the rhythmic clanking of rod lines.
Riddle guided visitors through dense nearby woods where remnants of the elaborate systems rust. The heavy equipment once “pumped with just these steel rods, just dangling through the woods,” he said. “You could hear them banging along – it was really something to see those work. The cost of pumping wells was pretty cheap.”
The heyday of central power units passed when electrification arrived, nonetheless, a few such systems remain in use today. Learn more about the evolution of petroleum production methods, the first counter-balanced “Nodding Donkeys” in All Pumped Up – Oilfield Technology.
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Recommended Reading: Drilling Technology in Nontechnical Language
(2012); Trek of the Oil Finders: A History of Exploration for Petroleum (1975). 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. Support this energy education website, subscribe to our monthly email newsletter, and help expand historical research. Contact bawells@aoghs.org. Copyright © 2026 Bruce A. Wells.
Citation Information: Article Title: “Eccentric Wheels and Jerk Lines.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/technology/jerk-lines-eccentric-wheels. Last Updated: June 8, 2026. Original Published Date: November 20, 2017.
