Dalton Model 181-4 Adding Machine

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This gray-green manually operated ten-key printing adding machine has two rows of white plastic number keys, including complementary numbers for subtraction. There are multiply and non-add keys on the left, and backspace and subtract keys on the right.
The multiply key acts like a repeat key - multiplication is strictly by repeated addition. The place indicator is above the keyboard, with a metal correction key to the left of it. Above and to the right are release, total, and subtotal keys. The printing mechanism and “4”” carriage are toward the back. The ribbon is black. The non-print key is next to the ribbon.
There is a place for a 2-1/2” paper tape, but no paper tape. Above the platen is a serrated edge to tear the paper. A zero value appears before a total. The metal crank with wooden handle is on the right. There are metal feet, but no evidence of any rubber padding.
The machine is marked on the front: Dalton (/) ADDING, (/) LISTING AND (/) CALCULATING MACHINE. The serial number below the crank is: NO170913.
This example came to the Smithsonian from Immaculata School in Washington, D. C.
Compare to MA.333874 and MA.333402.
This closely resembles the Model 181-4 machine described in The Business Machines and Equipment Digest, about. 1928, Sec 3-1, p. 14, 19. This was the “Special $100 Machine.”
Currently not on view
date made
Dalton Adding Machine Company
place made
United States: Ohio, Cincinnati
Physical Description
steel (overall material)
rubber (overall material)
plastic (overall material)
overall: 34.5 cm x 29 cm x 36 cm; 13 19/32 in x 11 13/32 in x 14 3/16 in
ID Number
maker number
accession number
catalog number
Credit Line
Gift of Immaculata School
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History


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