AddersNotched Band Adders
Building on ideas of Perrault and de Caze, in an instrument patented in Russia in 1847 Kummer replaced the wooden rods on an adder with metal bands notched on each side. Kummer’s idea was adopted by the Frenchman Troncet, who published what he called an Arithmographe in the 1890s. Adders with notched bands became the most common form of the instrument sold in the United States in the 20th century.
These stylus-operated instruments generally had a crook at the top of each column, to allow one to move adjacent bands in carrying (or, in some cases, borrowing) a digit. They were manufactured around the world. Occasionally, notched band adders were combined with a slide rule, to ease multiplication and division. A special form of the instrument, designed for computer programmers, aided calculations in base 60 rather than usual decimal arithmetic.
"Adders - Notched Band Adders" showing 1 items.
- The orange, black, and tan paper box contains a black and gold-colored metal instrument, instructions on pink paper, and a metal stylus. The device has seven columns for addition.
- The Baby Calculator was a handheld adder manufactured by the Calculator Machine Company of Chicago from at least 1925 into the 1940s. The Tavella Sales Company of New York City distributed this example. According to the box, it sold for $2.50 in the United States and $3.00 in Canada and other foreign countries. It has hooks at the top of each column for carrying in addition, but none at the bottom to assist in borrowing in subtraction.
- References: Typewriter Topics (March 1925), 59:76.
- Popular Mechanics (January, 1935), p. 128A; vol. 73 (March, 1940), p. 143A; vol. 83 (February, 1945), p. 192. A new design was introduced in 1945. See Popular Mechanics, April, 1945, p. 202.
- Currently not on view
- date made
- ca 1925
- Tavella Sales Company
- Calculator Machine Company
- ID Number
- catalog number
- accession number
- Data Source
- National Museum of American History, Kenneth E. Behring Center