Baldwin Arithmometer

Description
This is the United States Patent Office model for a machine for adding a column of digits patented by Frank S. Baldwin, who is listed on the patent as a resident of Philadelphia. It is the second of several patents Baldwin filed relating to adding and calculating machines.
The machine's back is roughly a half-disc, with the digits from 0 to 9 engraved across the top. A steel arrow rotates to point to any one of these digits. Rotating a brass knob returns the arrow to place. The knob is linked by gears to a small movable carriage at the base of the device. Returning the knob to its original position rotates two small register wheels. One of the wheels records the sum of the number entered and the number already set in the wheels. The other records the complement of this number. There are four sets of register wheels, linked to one another so that the machine carries, hence the machine may add numbers up to 9999.
A committee of J. W Nystrom, John Groesbeck, and Pliney E. Chase commented favorably on this machine before the Franklin Institute in Philadelphia. It received the Scott Medal of the Franklin Institute in 1874, and was produced in small numbers.
References:
U.S. Patent 153,522, July 28, 1874.
Thomas A. Russo Sr., and Conrad Schure, “The Calculating Engines of Frank S. Baldwin,” Rittenhouse, 11 #3 (May 1997), pp. 93-96.
Location
Currently not on view
Object Name
adding machine
date made
1874
patentee
Baldwin, Frank S.
maker
Baldwin, Frank S.
Physical Description
brass (overall material)
steel (overall material)
Measurements
overall: 2 cm x 13 cm x 11.3 cm; 25/32 in x 5 1/8 in x 4 7/16 in
place made
United States: Pennsylvania, Philadelphia
place patented
United States: Pennsylvania, Philadelphia
ID Number
MA*308935
accession number
89797
catalog number
308935
subject
Adding Machines
Mathematics
Science & Mathematics
Calculating Machines
See more items in
Medicine and Science: Mathematics
Adding Machines
Calculating Machines
Data Source
National Museum of American History, Kenneth E. Behring Center

Visitor Comments

Add a comment about this object

Submit a comment or ask a question about this object using the form below. Submissions are moderated and may receive a curator response. Please note that we cannot evaluate or appraise your personal artifacts. For other questions or general inquiries please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Image CAPTCHA
Enter the characters shown in the image.