Movement Checking Machine
Summary: A machine using a beam of light for checking the rate of balance wheel clocks and watches.
Application Date: 1927-09-01
Issue Date: 1932-03-08
Patent Number: 1848520
Serial Number: 216915
Notes: Westclox started putting a hole in the rim of their balance wheels to use this timing machine. They did this for many years.
Description: A rotating polygonaly faced mirror flashes a beam of light through an optical system. A hole in the balance wheel lets the light through when the hole passes by. If the balance wheel is in synchronization with the projected beams of light, the projected image of the light beam will be stationary on the display screen. If the balance is not in synchronization with the light beams, the project image will move across the screen.
Inventor Information: William Barton Eddison of Ardsley on Hudson, New York, Assignor to Western Clock Company , of Peru, Illinois, a Corporation of Illinois.
Patent Type: Utility
Patent Country: United States
Patent Category: Clock & Watch Manufacturing
Assignee: Western Clock Company 1912 to 1936
Inventor: Eddison, William
Attorney: Neureuther, Andrew
Patent URLs: U.S. Patent Database; Google Patents