thermo-junction resistor
Date1930-1950
Inventory NumberWJ0181
ClassificationResistor
Subject
Maker
Rawson Electrical Instrument Company
1918 - 1968
User
Psycho-Acoustic Laboratory, Harvard University
1940 - 1962
Cultural Region
Place of Origin
Dimensions6 x 10 x 4 cm (2 3/8 x 3 15/16 x 1 9/16 in.)
Material
DescriptionThis device is a heater resistance of 870 ohms. It is shaped like a tapered box with cylindrical binding posts on top. It was made for 2 milli amp. current (max 5 milli amp.). The number "No. 7558" is found on the plaque on top; the number "No. 9490" is found on the side of the device.
Signedmolded on bakelite: RAWSON / ELECTRICAL INST. CO.
Inscribedunder, stenciled: 10857 / OEM-sr-658 PAL
FunctionElectrical apparatus, possibly used in reaction time studies.
ProvenanceFrom the Department of Psychology, William James Hall, Harvard University.
Weston Electrical Instrument Corporation
Date: 1900-1917
Accessories: wooden instrument case (0526d); shunts (0526b and 0526c)
Object number: 0526a
Rawson Electrical Instrument Company
Date: circa 1930
Object number: 0428
Weston Electrical Instrument Corporation
Date: 1911
Accessories: shunt (0438b)
Object number: 0438a
Weston Electrical Instrument Corporation
Date: circa 1930
Accessories: standardization certificate of 1930 on inside of lid
Object number: 0318