precision wattmeter
Date1897-1903
Inventory Number0273a,b
ClassificationWattmeter
Subject
Maker
Siemens & Halske AG
1897 - 1966
Cultural Region
Place of Origin
Place of Use
Dimensions11.8 x 32.7 x 18 cm (4 5/8 x 12 7/8 x 7 1/16 in.)
Box: 16.2 × 36.8 × 26.4 cm (6 3/8 × 14 1/2 × 10 3/8 in.)
Box: 16.2 × 36.8 × 26.4 cm (6 3/8 × 14 1/2 × 10 3/8 in.)
Material
Accessorieswooden case
DescriptionA wattmeter, for measuring electric current, housed in a hinged wooden carrying case, with felt covered interior, and shaped spaces designed to hold the instrument. Meter rests on a rectangular wooden base also containing resistors and shunts, and has a bakelite terminal board.
Case has a latch closure, and an inscription stenciled on it in white lettering, "161 810 / Precision WM / 50A 100A / 30 1500V / MI / Std. Lab"
On its face, the instrument has a curved, rounded display window, with a scale marked in increments of 0 - 150. A curved reflecting strip is below the scale.
There are 3 metal plaques on front of wooden instrument case, (1) "Precision-Wattmeter / Max. E.M.F. 30 Volts / Max. Current 100 Amp. / Siemens & Halske;" (2) "Imported By / James Biddle / Philadelphia U.S.A.;" (3) "Germany."
Case has a latch closure, and an inscription stenciled on it in white lettering, "161 810 / Precision WM / 50A 100A / 30 1500V / MI / Std. Lab"
On its face, the instrument has a curved, rounded display window, with a scale marked in increments of 0 - 150. A curved reflecting strip is below the scale.
There are 3 metal plaques on front of wooden instrument case, (1) "Precision-Wattmeter / Max. E.M.F. 30 Volts / Max. Current 100 Amp. / Siemens & Halske;" (2) "Imported By / James Biddle / Philadelphia U.S.A.;" (3) "Germany."
Signedplaque on front of instrument: Precision-Wattmeter / Max. E.M.F. 30 Volts / Max. Current 100 Amp. / SIEMENS & HALSKE;
another plaque on front of instrument: IMPORTED BY / JAMES BIDDLE / PHILADELPHIA U.S.A.;
third plaque on front of instrument: Germany
Inscribedprinted on instrument display scale: 0-150;
inscription stenciled on case: 161 810 / Precision WM / 50A 100A / 30 1500V / MI / Std. Lab;
tagged on bottom: 257;
case marked: PROPERTY OF HARVARD ENGINEERING SCHOOL
Curatorial Remarks"HARVARD UNIVERSITY 997"
"161810 Precision Wm 50A 100A 30-1500V M Std. Lab."
FunctionAn instrument for measuring the electric power in watts of a circuit.
ProvenanceFrom the Harvard Engineering School, 11/56.
General Electric Company
Date: late 19th-early 21st Century
Object number: 1997-1-1077
Siemens & Halske AG
Date: circa 1910
Accessories: these shunts, as well as 0560b and 0560c came with Siemens and Halske meter 0560a
Object number: 0560d-h
Weston Electrical Instrument Corporation
Date: 1890-1920
Object number: 0313
Siemens & Halske AG
Date: 1897-1903
Accessories: wooden box
Object number: 0272a,b,c,d
Siemens Brothers & Company, Ltd.
Date: circa 1898
Accessories: wooden case
Object number: DW0299
