True RMS Voltmeter
Datecirca 1945
Inventory NumberWJ0310
ClassificationVoltmeter
Subject
Maker
Ballantine Laboratories, Inc.
1934-present
Place of Origin
Dimensions28.1 x 14.4 x 15.2 cm, 10 lb. (11 1/16 x 5 11/16 x 6 in., 4.5 kg)
Signedon plaque on base: ELECTRONIC VOLTMETER / MODEL 300 SERIAL NO 2518 / MADE BY / BALLANTINE LABORATORIES, INC. / BOONTON, NEW JERSEY, U.S.A.
Inscribedwritten in black on window: bad on / (100? illegible) readings
written on front in red: (greek letter Psi) (greek letter Phi)
stamped in white on base: OEMsr-658 PAL / 10456
written in red on base: 76-b-672 Tr-Hu- / 2/7/61
Curatorial Remarksthere is another voltmeter with a WJ number that originally was labelled WJ310. The instrument is a True RMS Voltmeter & is WJ0649. There is a chance that WJ0310 and WJ0649 are the same instrument and the matter should be investigated by examining the instruments
FunctionUsed to calibrate stimuli levels.
Historical AttributesUsed in the Psycho-Acoustic Laboratory (PAL) in Memorial Hall, Harvard University.
Ballantine Laboratories, Inc.
Date: 1947-1960
Accessories: one small plastic card: "Use the Ballantine voltmeter. . .".
Object number: 2006-1-0065
Ballantine Laboratories, Inc.
Date: copyright 1953
Accessories: "The Ballantine Rule," see 1998-1-1372a
Object number: 1998-1-1372b
Ballantine Laboratories, Inc.
Date: copyright 1953
Accessories: Instruction booklet, see 1998-1-1372b
Object number: 1998-1-1372a
Allen B. Du Mont Laboratories, Inc
Date: 1950-1960
Accessories: laboratory notes (in CHSI library)
Object number: 1997-1-0489
Wang Laboratories, Inc.
Date: 1970
Accessories: cloth instrument cover lined with tissue paper; black power cord; accompanied by central electronic unit (2001-1-003b); two page hand-written note from Peter L. Smith, Research associate, Harvard College Observatory, regarding the donation of the calculator, dated 10 December, 2001 (original and copy in instrument file); photocopy of operation instructions from the bottom panel of calculator unit (in instrument file); printed document on the history of the Wang 360SE by Rick Bensene (in instrument file); printed document on the history of the Want 360SE from Geocity (in instrument file); printed document on the Orbiting Solar Observatories (in instrument file)
Object number: 2001-1-0033a
Wang Laboratories, Inc.
Date: circa 1970
Accessories: accompanies WANG 360SE calculator (2001-1-0033a);
two page hand-written note from Peter L. Smith, Research associate, Harvard College Observatory, regarding the donation of the calculator, dated 10 December, 2001 (original and copy in instrument file); photocopy of operation instructions from the bottom panel of calculator unit (in instrument file); printed document on the history of the Wang 360SE by Rick Bensene (in instrument file); printed document on the history of the Want 360SE from Geocity (in instrument file); printed document on the Orbiting Solar Observatories (in instrument file)
Object number: 2001-1-0033b