Clarence Locke

/

Key Points: Clarence was the inventor of the Locke Adder, a row adder made of stamped tin, paper and cloth. Though not very user-friendly, the machine achieved a modest success over the course of a few years due to a low price and an extensive print advertising campaign. The device was most likely supplanted by […]

Read more

Ernest-Narcisse Lobbé

/

History of Computers and Computing, Calculating tools, Gadgets, Ernest-Narcisse Lobbé Key Points: Ernest-Narcisse Lobbé was a Parisian watchmaker who invented the Additionneur mécanique à touches, one of the first keyboard calculating machines in the world at the time. This one column adding machine is only known to be on paper and no details are known […]

Read more
Melvin Lovell's first patent for cash register and indicator

Melvin Lovell – Complete Biography, History, and Inventions

/

Key Points: Melvin Lovell learned carpentry in his young adult years, also serving the union army during the Civil War with his skills, which he continued to use once back in his home of Pennsylvania. With the backing of the State of Pennsylvannia, Lovell opened the Lovell Manufacturing Company, and grew it into one of […]

Read more

Gustavus Linderoos

/

Key Points: Gutavus Linderoos is noteworthy for holding a patent for an early adding machine which is housed at the National Museum of American History in Washington, D.C. He designed the adder specifically to be a compact, cheap and durable instrument for practical use. Gustavus Linderoos, a native of Finland, was a prolific astronomer and […]

Read more
Peter Lindholm adding machine

Peter Lindholm – Complete Biography, History, and Inventions

/

Key Points: In his short life of just 39 years, Peter Lindholm’s greatest accomplishment was the invention of the Lindholm Adder. The adder, which resembles an old-time cash register, is key-driven, with keys that have corresponding numbers ranging 0 to 9. The machinery resides within a wooden base. Besides his invention, Peter Lindholm taught at […]

Read more
The adding machine of Oskar Leuner.

Oskar Leuner – Complete Biography, History, and Inventions

/

Key Points: Oskar Leuner was a mechanical engineer who founded the Mechanical Institute of Oskar Leuner at the Technical University of Dresden. In 1877 he obtained a patent for a calculating device he designed which he dubbed an Addirstift–the adding pencil. Oskar Leuner’s device resembled a tire pressure meter, featuring a cylindrical sleeve shaped like […]

Read more
Judah Levin's adding machine

Judah Levin Adding Machine Explained — Everything You Need To Know

/

Key Points: Judah Levin held patents for 3 different calculating machines, including the Levin Adding Machine, currently housed at the Smithsonian National Museum of American History. His work influenced other subsequent Jewish inventors including Abraham Jakub Stern, Chaim Zelig Slonimski, David Roth, Izrael Abraham Staffel, and Jewna Jakobson. Rabbi Judah Levin held rabbinical positions in […]

Read more
Otto Lilienthal

Otto Lilienthal – Complete Biography, History, and Inventions

/

Key Points: Otto Lilienthal was a German aviation pioneer, the first person to fly gliders in a well-documented, repeatable, and effective manner, making the concept of “heavier than air” a reality. Otto Lilienthal wrote Birdflight As the Basis of Aviation which featured over 100 fascinating sketches, graphs, and schematics, as well as engineering assessments, and […]

Read more
Leonard Nutz lived in St. Louis between 1847 and 1858

Leonard Nutz – Complete Biography, History, and Inventions

/

Key Points: In 1858, Leonard N. Nutz invented the fourth patented keyboard adder in the US–a single-column adding machine. Up through 1880, the US patent office required inventors to submit a physical model of their creations. No such model exists for Leornard Nutz’s invention. Nutz also designed and built a compass for surveyor Benaiah Robinson […]

Read more
The patent drawing of Niels Larsen calculating machine

Niels Larsen – Complete Biography, History, and Inventions

/

Key Points: Nebraska native Niels Larsen made patent history with his invention of calculating machines to aid with taxes and interest. This American inventor also held two other US patents: a candle holder in 1874 and another for a sun-dial in 1884. The device consists of cylinders bearing numbers, the inner cylinder representing hundreds, the […]

Read more
Landin's Computing Machine

Landin’s Computing Machine Explained – Everything You Need To Know

/

Key Points: Peter John (P.J.) Landin, a British computer scientist who lived from 5 June 1930 to 3 June 2009, was the first to recognize that people might use the lambda calculus to describe a programming language. He owned other patents for cash registers and recorders, a phonograph, and a motion picture film, among others. […]

Read more

Charles Labofish

/

Key Points: Charles Labofish emigrated to the US from the Russian Empire in 1888, and held 15 US, Canada and British patents for his inventions, six of them being calculating machines. He also owned patents for typewriters, cyclometers, a log-sawing machine, and an indicating device for bicycles. Charles Labofish authored a book titled Labofish’s Catechism […]

Read more

Georges Lafond

/

Key Points Georges Lafond was a french engineer who lived at the end of the 19th century. He is most famous for inventing a circular adding machine that looked like a watch. His patent was accepted in 1899 but did not go into commercial production. History of Computers and Computing, Calculating tools, Gadgets, Georges Lafond […]

Read more

Samuel Kelso – Complete Biography, History, and Inventions

/

Key Points Samuel Kelso was an inventor born in 1835 in Scotland. He spent part of his adult life in Canada and America. Samuel Kelso is most famous for inventing a cipher that made adding and subtracting large summer fast and easy. In addition to making several mechanical inventions, Samuel Kelso was also an author, […]

Read more

Jehu Hatfield – Complete Biography, History, and Inventions

/

Key Points: Jehu Hatfield was an American inventor that held a patent for machine for computing interest, measuring lumber, and other purposes. Revolving cylinders inside the clock-like machine indicate varied interest sums, principal dollars and cents, and the clock hands show days of the month. Jehu Hatfield as a Pennsylvania native who relocated to New […]

Read more
The patent drawing of adding machine of Milton Jeffers.

Milton Jeffers – Complete Biography, History, and Inventions

/

Key Points: Milton Jeffers’ most notable invention is the simple adding machine (patent in 1863) in which he describes the device as a lever-set non-printing adding machine. In 1868, Jeffers patented a combined fodder cutter and corn husking machine. Jeffers’ adding machine didn’t look anything like the devices we’re familiar with in the modern-day but […]

Read more

Henry House

/

History of Computers and Computing, Calculating tools, Gadgets, Henry House Henry Alonzo House Key Facts: Henry House was an extremely prolific American inventor, who secured over 300 US and foreign patents. Like other inventors of his time, House invented a calculating device. House went on to invent an incredible buttonhole machine that that revolutionized the […]

Read more

Lewis Hosea and William Beardsley

/

History of Computers and Computing, Calculating tools, Gadgets, Lewis Hosea and William Beardsley Key Points: Lewis Hosea and William Beardsley, both wealthy men, obtained a patent for a keyboard adding machine in 1891. This adding machine was intended to produce a simple and compact hand instrument adapted to the use of book-keepers, cashiers, etc., for […]

Read more

Calvin Holman

/

History of Computers and Computing, Calculating tools, Gadgets, Calvin Holman  Key Points: A patent model of Calvin Holman’s adding machine is housed in the National Museum of American History in Washington, D.C. The brass and cloth device features a cylindrical case that contains two concentric rotating disks with 100 divisions (the digits from 0 to […]

Read more

De Kerniea James Thomas Hiett

/

History of Computers and Computing, Calculating tools, Gadgets, De Kerniea James Thomas Hiett Key Points: In 1897, De Kerniea James Thomas Hiett obtained a patent for a multi column keyboard adding and printing calculator. His machine was first called the Heitt Adding and Listing Machine, and then Universal Adding Machine from 1900 onward, and went […]

Read more
Milton's Adding Machine Patent Model

Milton Hinkle  – Complete Biography, History, and Inventions

/

Key Points: Very little is known about Milton Hinkle outside of his invention of a simple adding machine, other than that his father was a steamboat owner on the Ohio River. Hinkle’s simple adding machine, patented in 1878, is a similar design to those of Jabez Burns and John Ballou, and the prototype survives in […]

Read more

Christian Hergenroeder

/

History of Computers and Computing, Calculating tools, Gadgets, Christian Hergenroeder Key Points: Christian Hergenroeder was the inventor of an adding machine, the patent model of of which is housed in the collection of National Museum of American History in Washington, D.C. C.W. Hergenroeder was born in Germany in 1863 and emigrated to USA in early […]

Read more

Johan Hellström

/

Key Points Johan Fredrik Hellström was a machinist from Sweden. In 1879 he invented an adding machine that could calculate sums. His machine made calculating sums in the hundreds of thousands fast and easy. History of Computers and Computing, Calculating tools, Gadgets, Johan Hellström Hellström’s Räknemaskin (calculating machine) Johan Fredrik Hellström was a Swedish machinist, […]

Read more

Ferdinand Hebentanz

/

Key Points Ferdinand Hebentanz was a watchmaker from Budapest. He invented a keyboard-type adding machine to calculate sums in 1873. His machine had springs that you could wind like a modern clock and was easier to use than other adding machines of that time. History of Computers and Computing, Calculating tools, Gadgets, Ferdinand Hebentanz Ferdinand […]

Read more
To top