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Weston A.C. Voltmeter, Model 155
Newark N.J.
52646
provenance: Humboldt S-T-C; c.1926
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Usage/History: Instruments such as this were used by
trained technical/scientific staff for precision laboratory measurements
of voltage, and as secondary standards for calibrating other meters.
The mirrored scale makes it easier to read the instrument to a
given accuracy by enabling the user to avoid parallax errors.
This particular instrument was specified to be accurate to ±0.5%.
- Description: The instrument in housed in a 71/8 x
6 3/4 x 3 1/4" walnut case with a leather handle on top.
All hardware is nickel-plated brass. The front panel has a window
cut into it to view th emeter face. The meter has a mirrored
scale. The serial number (32646) is hand written on the white
paper scale behind the face plate. The two screws in the side
of the case allowing access to the movement are sealed with black
sealing wax(?) and stamped with a "W." The instrument
has four rubber feet on the bottom for storage and four more
feet (one missing) on the back for use during operation. There
are two Bakelite binding posts on the left side of the instrument's
case, and a momentary contact switch with a vulcanite button
on the lower right side of the front.
Beneath window is a brass escutcheon labeled "0
CORRECTION" giving access to the zero correction screw.
There is a brass plate finished in black and nickel plating attached
to the front of the cabinet below the escutcheon:
- MADE BY THE
- WESTON ELECTRICAL INSTRUMENT CO.
- NEWARK, N.J., U.S.A
- PATENTED
- JAN. 1, 95. MAR. 22, 96. OCT. 4,
98.
- OTHER PATENTS PENDING
- MODEL 155 NO 32646
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- The walnut case has been stripped and refinished with "Watco
Danish Oil," all exposed metal parts have been acid cleaned
and lightly polished, Bakelite and rubber parts have been cleaned
and polished with furniture polish, and the leather handle has
been treated with neatsfoot oil. One of the rubber feet is missing
from the bottom. There is an oval brass tag attached with brass
brads bottom of instrument stamped HUMBOLDT S-T-C / 2098.
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- © R. Paselk
- Last modified 1 December 2002
- All photographs © R. Paselk
