U.S. Patent number: 487,824
Filed: Feb. 15, 1892
Issued: Dec. 13, 1892
Inventor: J. W. Culmer
Assignee: The Computing Scale Company
In the patent, Culmer described how someone would use the device:
"In using the computing-poise with the weighing-scale the operator sets the poise at zero on the beam and the decimal-disks each show "0" at the face-opening. The pointer, if then set at 10 on the price-arc, will thereby move the cam 18, and thereby carry down the disk 8,theyoke-frame, and its connected roll 12 nearer to the center of the disk 7, and assuming the pound-divisions to be two inches apart, or any other fixed distance, the disk 7 and the decimal-disks 4, 5, and 6 will be moved ten times the distance upon their axis as they would if the pointer were placed at "1" on the price-arc and the roll 12 at the periphery of the disk 7."
Image taken from U.S. Patent 487,824 - Digitized by Google