Calculator - Olivetti Summa Quanta 20

Structure of mechanism
Function	This is an electric office calculating machine which operates on either 110 or 220 volts. There is an integrated printer, which uses an ink ribbon. The machine has a reduced keyboard. The sub-total and total keys are marked respectively with a diamond and a star. The input register is visible through a positioning window. A small cursor marked with an arrow enables re-set. The C key is used for error correction. The mechanism is a rack and pinion drive invented in 1722 by Chrétien-Louis Gersten and developed by Olivetti starting in 1934. The number keys each have a tab which blocks the rack and pinion system, carrying the input figure onto the totalizer wheels.

Guidance function
Trace of a dedicated point on follower	Open trace
Dimension of mechanism	spatial

Application
Examples of application	This machine is above all an adding machine, but it can perform three operations; multiplication is by repeated additions via the X cursor.

Permanent links

DMG-Lib		https://www.dmg-lib.org/dmglib/handler?mcdsc=3170025
Europeana		http://www.europeana.eu/portal/record/2020801/dmglib_handler_mcdsc_3170025.html