Jeffers Adding Machine

Description
This U.S. patent model for a lever-set non-printing adding machine has a frame of two brown round end pieces joined by a central shaft and by two pieces of brass at the outside. The shaft carries six toothed wheels that may be rotated with the fingers. Each wheel has 30 teeth and is joined to a brass ring on its right. Around the rim of each ring is a slip of paper with the digits from 0 to 9 printed on it three times. One third of each ring is covered by a metal piece which has a window at the bottom and the digits from 1 to 9 engraved on it. To enter digits, wheels are rotated forward the distance indicated by these digits. Through the action of a carry mechanism, the total appears in the windows.
Milton C. Jeffers, who took out this patent in 1863, was a resident of New York, N.Y. He is probably the Milton C. Jeffers who lived from about 1823 until dying in New York City in 1896, and who took out two further patents for agricultural machinery. A Milton C. Jeffers is listed in New York City directories of the period as an agent and as a broker.
References:
U.S. Patent 40,105, September 29, 1863.
U.S. Patent 74,379, February 11, 1868.
U.S. Patent 108,484, October 18, 1870.
Location
Currently not on view
Object Name
adding machine
date made
1864
patentee
Jeffers, Milton C.
maker
Jeffers, Milton C.
Physical Description
brass (overall material)
paper (overall material)
plastic? (overall material)
steel? (overall material)
Measurements
overall: 10 cm x 11.5 cm x 10 cm; 3 15/16 in x 4 17/32 in x 3 15/16 in
place made
United States: New York, New York
place patented
United States: New York, New York
ID Number
MA*309322
accession number
89797
catalog number
309322
subject
Mathematics
Science & Mathematics
Adding Machines
See more items in
Medicine and Science: Mathematics
Adding 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.