Grant Experimental Model Calculating Machine
date: label: date made
content: after 1895
name: label: maker
content: Grant, George B.
notes: label: Description
content: This lever-set non-printing connection pawl calculating machine is the last experimental model of George B. Grant, designed to incorporate subtraction and division as well as addition and multiplication. It has a wooden base and a brass frame. Five pins slide to set numbers. Positions next to the pins are labeled from 0 to 9. Moving back a pin drives back a toothed rack.
label: Description
content: Behind the racks is a movable carriage with 11 gears on it. The carriage can be set at six different positions. When the racks are pushed back (there is no cam to drive the racks), the gears are engaged, and rotate in proportion to the number set. The gears move in the opposite direction when the racks are moved forward. Carry teeth are arranged in a spiral shaft above the carriage. A lever at the front of the machine may be rotated in a way that may affect the action of the carry shaft. A crank on the right zeros the result shaft.
label: Description
content: This model represents Grant’s enduring interest in the improvement of calculating devices. It did not lead directly to any commercial product.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Calculating Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Edwin A. Bayley
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.310650
label: catalog number
content: 310650
label: accession number
content: 118852
objectType: label: Object Name
content: calculating machine
physicalDescription: label: Physical Description
content: brass (overall material)
label: Physical Description
content: wood (overall material)
label: Measurements
content: overall: 21.2 cm x 23.5 cm x 30 cm; 8 11/32 in x 9 1/4 in x 11 13/16 in