Ammeter

Physics

Accession Number: 2009.ph.85

Description:

There are three metal terminals on a wooden base, two negative and one positive. Under the first negative terminal there is a label reading “25.M.AMPS”. The second negative terminal is labeled “50 AMPS”. The positive terminal is labeled “+”. One of the negative terminals is connected to a fuse and then a switch. The switch permits the circuit to change from one negative terminal to the second negative terminal. The terminals then connect to a dial. The base is attached to a vertical wooden square. This wooden base has a circular metal faceplate. Underneath this label is a dial with a needle. The scale ranges from 50-0 then 0-50, and underneath the scale is written “D.C. AMPERES”. Attached directly behind the faceplate is a black metal cylinder approximately 20.5 cm in diameter and 8 cm in length. The cylinder is labelled “25 Milliamps”, “22 OR”, “50 AMPS WITH SHUNT”.

Alternative Name: Ampere Meter

Primary Materials: Wood, Metal, Glass

Markings:

Old inventory number = phy1028c. The top of the faceplate is inscribed “WESTON”. Under the dial is a plate inscribed “WESTERN ELEC’L INST CO. NEWWARK N.J., U.S.A.”, “PATENTED”, “MODEL 57 No. 82706”. Underneath this plate is a label reading “WESTERN ELECTRICAL INSTRUMENT Co.” and “NEWARK, N.J., U.S.A.”.

Dimensions (cm):

Height = 27.5 cm, Length = 27.5 cm, Width = 20.5 cm

Function:

Measuring large currents with less implicit accuracy than a galvanometer. Used for measurements of large currents.

Condition:

Associated Instruments:

Manufacturer:

Western Electrical Instrument Co., Newark, New Jersey, USA

Date of Manufacture:

Provenance:

Historical Notes: