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- Felt & Tarrant Comptometer, 1951 - Mechanical adding machines like this Comptometer were indispensable--and almost indestructible--office equipment until the computer era. Dorr Felt's 1884 invention of a key-driven mechanical adding machine had become big business by the 1950s, when this Comptometer was made. This particular Comptometer was used in the accounting department of an eyewear manufacturing company from 1951-1967, when its operator retired.
- 1951
- Collections - Artifact
Felt & Tarrant Comptometer, 1951
Mechanical adding machines like this Comptometer were indispensable--and almost indestructible--office equipment until the computer era. Dorr Felt's 1884 invention of a key-driven mechanical adding machine had become big business by the 1950s, when this Comptometer was made. This particular Comptometer was used in the accounting department of an eyewear manufacturing company from 1951-1967, when its operator retired.
- Felt & Tarrant Comptometer, circa 1945 - Mechanical adding machines were indispensable office equipment used before the computer era. These devices were perfected by the American Arithmometer Company in 1886, spurred on by William Seward Burrough's desire to reduce drudgery in clerical arithmetic work. Transistors and electronic desktop calculators displaced adding machines in the 1950s; by the 1970s, microchips reduced calculators to the size of a shirt pocket.
- circa 1945
- Collections - Artifact
Felt & Tarrant Comptometer, circa 1945
Mechanical adding machines were indispensable office equipment used before the computer era. These devices were perfected by the American Arithmometer Company in 1886, spurred on by William Seward Burrough's desire to reduce drudgery in clerical arithmetic work. Transistors and electronic desktop calculators displaced adding machines in the 1950s; by the 1970s, microchips reduced calculators to the size of a shirt pocket.