General Electric Alternating current ammeter circa 1914, with a mirrored scale for reading accuracy, manufactured after 1914. Prior to 1914 the Thomson name was on most GE measuring equipment nameplates. 

Electrical power in North America is generated at 60 cycles per per second A Micromax recorder similar to this one built by Leads & Northrup was used in both Rossdale and Clover Bar generating Stations this particular instrument is from the old Celanese ...

An interactive model A.C. generator connected to a Weston model 1 D.C. volt-ammeter and a string of leds. The alternator has a stator coil, and a rotor which consists of two permanent magnets mounted to an axel fitted ...

Floor display of vintage commercial/industrial/residential Watt Hour, VAR, Voltmeters, Ammeters, Consumption, 3 Phase, 1 Phase revenue meters, manufactured by Sangamo, GE, Westinghouse, Reyrolle, Weston,

The cabinet was used to control the cooling medium (hydrogen) within the Generator Consisted of 4 Gauges for: Hydrogen Temperature Seal oil pressure Hydrogen Pressure Carbon Dioxide Pressure Alarm panel Hydrogen Purity Meter Flow Meter AC and DC seal ...

Impedance bridge theory developed in 1830's and in the 1840's, C. Wheatstone improved it for accurate resistive/impedance testing. Note "magic eye" tube lower center.

The Boiler Pressure Gauge indicated the steam pressure within the boiler drum. The gauge was located 15 feet above the operating floor and clearly visible from the firing aisle. Manufacturer: The JAS Morgan Brass Manufacturing Company Ltd. Type: Bourden ...