Title
The Adder calculator
Catalog Number
B1636.01
Type
Physical object
Description
The Adder Calculator consists of two interlocking metal dials, one small and one large etched with numbers around rotating internal components. There is a small open window where the two dials meet. The smaller side includes text "PATD NOV 5TH 12TH 1889". Text on the larger dial reads "The Adder" and "C.H. WEBB". There are five small to large rust spots on the back around the center opening of the smaller dial.
Date
1891
Manufacturer
Webb, C. H.
Identifying Numbers
Other number |
4051 stamped on bottom of unit |
Dimensions
1/4 x 6 1/4 x 4 1/4 in.
Category
Calculator/mechanical
Collection Title
Gwen Bell artifact and book collection
Series Title
Pre-computing artifacts