Pellat scales is an electrodynamic instrument. It is made up of an cylindrical spool with vertical axis, which is placed inside another larger cylindrical spool with horizontal axis. Currents up to 500 mA can be measured with this instrument.
INSIGHTS
The two windings are electrically connected "in series" by means of two silver pigtails, so a current that passes through them both tends to align them, rotating the internal, movable spool. The latter is integral to the yoke of a precision balance. In this way, the mechanical torque that restores balance leads back to the value of the electric current. A micrometric screw counterweight makes possible to adjust the initial position. Designed by the French physicist Joseph Henri Pellat (1850-1909).
Data sheet
Categoria: electric appliance
Planner: J.H. Pellat
Producer: J. Carpentier
Year of production: 1898 (Parigi, Francia)
Dimensions: 270x480x330mm
Materials: brass, glass, copper, wood.
