wattmeter without casing
Datelate 19th-early 21st Century
Inventory Number1997-1-1077
ClassificationWattmeter
Subject
Maker
General Electric Company
1892-present
Cultural Region
Place of Origin
Dimensions18.3 × 18.4 × 22.5 cm (7 3/16 × 7 1/4 × 8 7/8 in.)
Material
DescriptionWattmeter, mounted on a brown wooden base, without outer casing. The wooden base has carved channels into which the instrument and its components, mounted on a brass frame, are set. The instrument display is curved and rounded and is printed with a double scale. The top scale is marked from 0-50, in increments of 0.5; the bottom scale is marked from 0-25, in increments of 2.5. The display has a triangular metal indicator, narrowing to a long point.
The front of the instrument has two cylindrical black plastic knobs mounted on the left, along with a recessed button; the right side has three metal posts.
The back of the instrument has brass mounting brackets, a pair of current coils or fixed electrical coils, a moveable, potential coil, and cloth covered electrical wiring connecting the components. Back of instrument also has a series of 10 vertical plates, wired in series.
Amp max .5/1.0 Volts Max 200 N.P. 44419.
The front of the instrument has two cylindrical black plastic knobs mounted on the left, along with a recessed button; the right side has three metal posts.
The back of the instrument has brass mounting brackets, a pair of current coils or fixed electrical coils, a moveable, potential coil, and cloth covered electrical wiring connecting the components. Back of instrument also has a series of 10 vertical plates, wired in series.
Amp max .5/1.0 Volts Max 200 N.P. 44419.
Signedprinted below scale: GENERAL ELECTRIC (with GE logo) / U.S.A. / NO. 918526 TYPE P-3 AMP. MAX. 0.5 / 1.0 VOLTS MAX. 200 / NH.P. 44419
Inscribedstamped into bottom edge of instrument: 9L3536
Curatorial RemarksSeveral tags indicate that this wattmeter was badly damaged and had been kept for demonstration of what such wattmeters look like inside.
Tag 1: "unmounted for inspection"
Tag 2: "dual coil electrodynammometer, meter badly damaged"
Tag 3: "HOLD for Photo & Parts"
Instrument Card of object 0558 has a photograph of this object, possibly as example of what the instrument would look like without case and face plate.
Functiona wattmeter, or "dual coil electrodynammometer," for measuring electric power consumption in a circuit.
The outer casing has been removed, most likely for demonstration purposes.
The outer casing has been removed, most likely for demonstration purposes.
ProvenanceFrom the Lyman Laboratory Attic (Physics Department, Harvard University). 1-12-72.
Siemens & Halske AG
Date: 1897-1903
Accessories: wooden case
Object number: 0273a,b
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
French
Date: circa 1895
Accessories: key, metal rod with sphere at one end
Object number: DW0097
Weston Electrical Instrument Corporation
Date: 1894
Accessories: Weston portable multiplier (0279b); standardization certificate on back of lid
Object number: 0279a
Harvard Cyclotron Laboratory
Date: 1947-2002
Object number: 2003-1-0291
Davis & Son
Date: 1843-1873
Accessories: small metal key
Object number: 1998-1-0606
See also/See also
