Two photographs (bromide prints) of an original calculating machine made by Pascal; (a) exterior
1925
Photo of pencil drawing of Staffel's calculating machine
1927
Photograph of engraving
1925
Bromide print of Burrough's adding and listing machine
1925
Two photographic prints of Pascal's calculating machine (8-figure) (a) with lid of case closed; (b) lid opened
1925
Photograph of engravings of Morland's multiplying instrument
1925
Photo of Stern's calculating machine
1927
Two photographic prints of Pascal's calculating machine (6-figure) (a) lid closed; (b) lid opened
1925
Photographic prints of Leibniz's calculating machine
1925
12" x 10" bromide print of Colts calculator
1925
Photo print
1924
Photo print of Barrett adding machine, c. 1915
1925
Six photographs (each 11 1/2" x 9 1/2") showing Burroughs machines in operation in Banks etc (Westminster Bank
1929
Print of "Archimedes" calculating machine
1925
Photographic enlargement of engraving of Blaise Pascal
Photographic print of Arithmaurel calculating machine
1925