Title
Early Calculating Devices - E.D. Barbour
Catalog Number
102704303
Type
Still Image
Description
B&W image of Sheet 2 of a Patent application for "Improvement in Calculating-Machines" No. 130,404 Patented Aug 13, 1872.
Dimensions
overall: 5 in x 4 in
Category
Identification photograph
Credit
Courtesy of Gwen Bell