Direct II Adding Machine by Muggli

This full keyboard non-printing adding machine has ten columns of keys, with nine keys per column. The keys are colored black and white according to the place value of the digits. The black keys are round, the white keys are polygonal. At the top are 11 windows that show the result. These windows are covered by a single piece of glass. Two decimal markers slide in front of these windows. A zeroing lever is on the right side. Red plastic function keys are to the right and the left of the keyboard.
The machine is marked on the top: DIRECT II. It is marked at the front: THEO MUGGLI ZURICH (/) MADE IN SWITZERLAND PROTECTED BY PATENTS. The serial number, on the bottom at the front, is 20146. This object was number 23 in the Felt & Tarrant collection of adding and calculating machines. Manufacture of the Direct II began in the 1920s or 1930s.
“Theo Muggli Passes Away,” Business Equipment Topics, 84 (June, 1933): p. 22.
Currently not on view
date made
ca 1930
Muggli, Theo
Muggli, Theo
place made
Schweiz: Zürich, Zurich
place distributed
Schweiz: Zürich, Zurich
Physical Description
plastic (overall material)
steel (overall material)
glass (overall material)
brass (overall material)
rubber (overall material)
overall: 16.5 cm x 30 cm x 40 cm; 6 1/2 in x 11 13/16 in x 15 3/4 in
ID Number
accession number
catalog number
Credit Line
Gift of Victor Comptometer Corporation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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