Olivetti Divisumma GT24 Calculating Machine

This ten-key listing electric calculating machine has a gray plastic case with a black lid that lifts to reveal the mechanism. The nine white numeral keys are arranged in a block. Below these are three black keys. One has one white dot, one has two dots and the third has three dots (for differing numbers of zeroes).
To the right of the keys is a black bar marked +, a red bar marked -, a black T key, and a black ST key. There are three more black keys, six blue keys, and a red key on the left, as well as two levers with blue plastic knobs. Below the keyboard is a GT (grand total) bar and a switch. Above the keyboard is a place indicator. The printing mechanism behind this includes four type wheels to indicate dates, 13 for totals and two for symbols. Totals are printed in red. A serrated edge eases tearing the paper tape.
The machine has a gray cord and the 3-1/2” (8.8 cm.) wide paper tape. A mark at the top reads: olivetti. A mark on a tag attached to the back reads: Olivetti Divisumma GT 24 (/) MADE IN ITALY * FABRIQUE EN ITALIE. A nother tag attached to the back reads: PROPERTY OF (/) 112551 (/) SMITHSONIAN INSTITUTION. The serial number, written on the inside of the back of the top and on a plate attached to the bottom, is 2866218.
The Italian artist Marcello Nizzoli designed this and other Olivetti calculating machines.
This particular example was used in the Office of the Registrar of the National Museum of American History and is dated from its property tag number.
Compare 1979.0854.01.
S. Kicherer, Olivetti: A Study of the Corporate Management of Design, 1990, pp. 28–29.
Currently not on view
Object Name
calculating machine
date made
Physical Description
metal (overall material)
rubber (overall material)
plastic (overall material)
paper (overall material)
overall: 26 cm x 24.5 cm x 43 cm; 10 1/4 in x 9 21/32 in x 16 15/16 in
place made
ID Number
maker number
accession number
catalog number
Science & Mathematics
Calculating Machines
See more items in
Medicine and Science: Mathematics
Calculating Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Additional Media

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