Accession Number: 2009.ph.163
The Direct Current Ammeter is mounted on a wooden base with a wooden backboard. At the top of the face is a scale calibrated in amperes, ranging from 0-1.0. Under the scale is written “USE WITH EXTERNAL SHUNT”. On the back of the ammeter is a light bulb socket, minus the light, ostensibly meant to light the scale face. To either side of the socket are two terminals, labeled “Positive” and “Negative” respectfully, with non-production labels. There are also four distinct sets of terminals on the very back of the ammeter, with labels reading “1 AMP., 5 AMP., 10 AMP., and 20 AMP., respectively. Each terminal (except for the 20 AMP. terminal) has an additional metal plaque indicating amperage and what model it is to be used with.
Alternative Name: Direct Current Ammeter
Primary Materials: Wood, Metal, Glass
Old inventory number = phy1026A-B. The face of the ammeter reads “WESTON STATION AMMETER, NO. 10870”, “Made By WESTON ELECTRICAL INSTRUMENT CO., NEWARK, N.J., U.S.A.”. The face also has a small plate with patent information.
Dimensions (cm): Height = 36, Width = 33, Length = 24
Measuring amperage in electrical circuit; possibly a demonstration device
Good. The metal is corroded in places. The wood backboard is marked and nicked. The glass of the scale is cracked in half.
Weston Electrical Instrument Company, Newark, New Jersey, USA.
Date of Manufacture: Early 20th Cent.
University of Toronto Department of Physics