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1117 Wolfendale accuracy alternating current American Radiator Company ammeter angle apparatus assignor Automatic Bacharach Industrial Instrument Bausch Boiler Bristol Company Taylor Bulletin C. J. Taylor Instrument calorimeter carbon Catalogue circuit Colonial Supply Company Company Bristol Company Company Taylor Instrument described determination device diameter direct current East Pittsburgh ELECTRIC METERS Electrical Instrument Company Elliott Company Engg Engineer England equipment fuer furnace galvanometer gauge gauge block Germany heat Hoyt Electrical Instrument HYDROMETERS Indicating instru insulation issued Laboratory leaflet light liquid Lomb Optical magnetic manufacturers material measuring mechanical ment metal meter method microscope motor MULTIMETER obtained ohms operation Otto Fennel Sons paper Pittsburgh plant potentiometer pressure Prof Pyrometer Rawson Electrical Instrument reading Research resistance scale Specific Gravity speed standard steel surface Tachometers Taylor Instrument Companies temperature Tester Thermometers THERMOSTATIC tion tube valve voltage voltmeter WATTMETERS York