Device for recording warder patrols in a Lunatic Asylum Psychology, Psychiatry & Anthropometry 1864-1897
Model of chronometer escapement, for use with a projecting latern, made by Dent, 1950-1883. Represents the detent chronometer escapement, invented by Thomas Earnshaw 1777-1787. This escapement was typically used in marine chronometers. Model representing Earnshaw's detent chronometer escapement, 1950-1883 Time Measurement 1950-1883
Model by Dent of Graham's cylinder escapement for use with lantern, 1850-1883 Model of Graham's Cylinder Escapement, 1850-1883 Time Measurement 1850-1883
Model by Dent of lever escapement for use with lantern, 1850-1883 Model of a Lever Escapement , 1850-1883 Time Measurement 1850-1883
