Dating faber castell slide rules
Knuckle couplers replaced the much more dangerous link-and-pin couplers and became the basis for standard coupler design for the rest of the 19th century. patent #147,119 was filed on January 22, 1874, and issued to Francis on February 3, 1874.
The knuckle coupler was invented and patented by Eli H. 1874 Fire sprinkler (automated) A fire sprinkler is the part of a fire sprinkler system that discharges water when the effects of a fire have been detected, such as when a pre-determined temperature has been reached. Parmelee of New Haven, Connecticut invented and installed the first closed-head or automated fire sprinkler in 1874. A jockstrap, also known as a jock, jock strap, strap, supporter, or athletic supporter, is an undergarment designed for supporting the male genitalia during sports or other vigorous physical activity.
After one of Davis' customers kept purchasing cloth to reinforce torn pants, he had an idea to use copper rivets to reinforce the points of strain, such as on the pocket corners and at the top of the button fly.
Davis did not have the required money to purchase a patent, so he wrote to Strauss suggesting that they both go into business together.
Then, like several other late 19th- and early 20th-century North American mathematicians, Archibald traveled to Germany, spending the academic year 1898–1899 at the University of Berlin and 1899–1900 at the University of Strasbourg. Archibald then returned to Canada, where he taught for several years before joining the faculty of Brown University in Providence, R. He remained at Brown for the rest of his academic career.
The firm was renamed Faber-Castell in 1905, although instruments continued to be marked "A. He began his college education in Canada and completed a bachelor's and a master's degree from Harvard University in Cambridge, Mass. in Strasbourg in 1900 and may have purchased this slide rule near the end of this European sojourn. This work is undated, but it refers to a prize awarded to Faber at the Exposition universelle held in Paris in 1900.
It has unlettered A and D scales on the base and B and C scales on one side of the slide. The indicator is glass in a metal frame, with a circular scale and pointer on the right side of the frame for registering digits to be added or subtracted during the calculation.
1874 Spork A spork or a foon is a hybrid form of cutlery taking the form of a spoon-like shallow scoop with three or four fork tines. A jockstrap consists of a waistband (usually elastic) with a support pouch for the genitalia and two elastic straps affixed to the base of the pouch and to the left and right sides of the waistband at the hip.
The spork is a portmanteau word combining spoon and fork. The jockstrap has been part of men's undergarments since 1874 when it was invented by C. Bennett of Chicago to protect and support bicycle riders (back then they were known as "jockeys") who were navigating the cobblestone streets common to the era.
On the back of the inside is written in pencil: RCA. In 1943, he became the founding editor of the journal Mathematical Tables and Other Aids to Computation, a publication that included some of the first articles published about electronic computers. Hopp, Slide Rules: Their History, Models, and Makers (Mendham, N.
Faber was a German company that began manufacturing slide rules in 1882 and introduced this form of instrument around 1894. Archibald's wide ranging interests included the history of mathematics, the computation of mathematical tables and the development of computing tools.