TitleEarly Calculating Devices - Patent Application - "Calculating Machine"
Dimensionsoverall: 5 in x 4 in
DescriptionB&W image of a Sheet 1 of 5 sheets of a Patent Application for "Calculating Machine" Patented Sept 10, 1878 No. 207,918
R. Verea.It has two diagrams showing the mechanisms involved in the machine.