Surveying Instrument Collection
Maker 
Facit AB (Sweden) 
Model 
CM 216 
Serial Number 
1420281 
Dimensions 
Length 270mm, Width 240mm, Height 160mm 
Image 

Description 
This Calculating Machine is a later model introduced by FACIT in about 1950. The machine incorporates a barreltype mechanical design with a 'tenkey' keyboard consisting of numbers labelled 0 to 9. The machine carries three registers, the product register (register for showing the results of additions) on the top left, the multiplier register on the top right and the 16digit setting register on the bottom left. The setting register is fed by the tenkey keyboard at the bottom. Each number is typed on the keyboard, digit by digit, and the setting register moves one space to the left each time a digit is entered. The main handle and the setting register clearance handle are at the right, as usual, and the four redcoloured keys situated next to the tenkey keyboard are for controlling the carriage movement. This tenkey machine allows very simple touch operation, but necessitates a zero being entered wherever it is required. On the other hand, tenkey machines tend to be smaller and lighter than their fullkeyboard competitors. The machine provides the provision for all four arithmetic operations to take place, namely addition, subtraction, multiplication and division. 
History & comments 
The Facit calculating machine has perhaps been, in the past, the second most widely applied arithmetic instrument, with the Brunsviga being the first. These types of mechanical calculators (with numerical tables of trigonometric functions) replaced logarithmic tables and calculations in surveying. They were later superseded by electronic pocket calculators (Hewlett Packard HP35 in about 1973) and desktop computers. 
Conservation 
In a container 
Condition 
Operational 
Remarks 

Dates 
Manufactured in 1950 (approx.). Catalogued in 1997 