Images(3)

Ammeter

Object number2007.167.579

Manufacturer Westinghouse Electric and Manufacturing Company (1886 - 1945)

Date1925

OriginNewark, NJ

OriginPittsburgh, PA

MediumWood; Plastic; Metal; Glass; Paper

Credit LineTransfer from George Westinghouse Museum Foundation

DescriptionBrown wooden and black plastic ammeter. Rectangular base that slopes up to a wooden lid. Lid is attached by two metal hinges on the back and a metal clasp. Inside is a black rectangular plastic. Six silver metal knobs at the top with Gold text above. A circular colorless glass underneath. Under the glass is a black meter with black text. Black metal needle. Paper description label on the inside of the lid with text. White text on the front of the ammeter next to the clasp. Black tape on top of the lid with white text.DimensionsHeight x Width x Depth (Lid open): 4.5 x 16.75 x 8.5 in. (11.4 x 42.5 x 21.6 cm)
Height x Width x Depth (Lid closed): 4.875 x 8 x 8.5 in. (12.4 x 20.3 x 21.6 cm)
InscriptionsGold text above the silver knobs states "10 / AMP / 5 / AMP / 10 / AMP".

White text on the top of the ammeter states "82".

White text on the front of the ammeter states "82".

Blue handwritten text on the top of the paper inside the lid states "Black scale / 10 amp scale / 5 a. scale / Red scale".
MarksBlack text on the inside of the meter states "AMPERES / 25-60 CYCLES / WESTINGHOUSE ELEC. & MFG CO. / PITTSBURGH, PA. / PATENTED / FEB.25.96: JULY 11.05 / STYLE NO. 169512 "E" / SERIAL NO. 6P1193".

Black text on the paper inside the lid states "WESTINGHOUSE PORTABLE AMMETER / TYPE PM-FOR ALTERNATING CURRENT / Style No. 169512 E / Serial No. 671193 / Amperes 5-10 / 25-60 Cycles / This instrument is calibrated for use in a horizontal position. It should be handled / carefully and not subjected to rough usage. The movement is of the induction type / comprising a light metal drum pivoted in the air-gap of an electromagnet; its motion / is composed by the control spring. / On 25 or 60 cycles the calibration is correct. For intermediate frequencies, the / curve should be used to determine the correction necessary . / [chart] / Repairing can be done most satisfactorily at our Works. Interchangeable repair / parts can be furnished, however, and purchasers equipped for doing repair work will / find that the construction of the meter facilitates this. After withdrawing the four / screws at the corners of the bottom of the meter and the connection straps on the face / of the meter, the sides and face of the case can be removed. This leaves the measuring / element mounted on the base in good position for inspection or repairs. / Calibrated Sept. 16, 1925 / Checked September 17, 1925 / Approved 1925 / Rechecked 19__/ Rechecked 19__ / Rechecked 19__ / WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY / NEWARK WORKS / NEWARK, N.J".

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