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Image
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Source
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Observations
from the source
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Gallenkamp
(1930s)
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Voltmeter
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Gallenkamp
(1930s)
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Voltmeter
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Gallenkamp
(1930s)
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Voltmeter
and ammeter
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Gallenkamp
(1930s)
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Multirange
test meter
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Gallenkamp
(1930s)
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Ammeter
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Gallenkamp
(1930s)
|
Ammeter
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Gallenkamp
(1930s)
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Ammeter
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Gallenkamp
(1930s)
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Universal
indicator
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Gallenkamp
(1930s)
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Alltest
as a voltmeter
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Gallenkamp
(1930s)
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Alltest
as an ammeter
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Gallenkamp
(1930s)
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Combined
voltmeter and ammeter
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Gallenkamp
(1930s)
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Ammeter
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Gallenkamp
(1930s)
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Moving
coil instrument
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Gallenkamp
(1930s)
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Hot
wire ammeter
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Gallenkamp
(1930s)
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Moving
iron instrument
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Gallenkamp
(c. 1939)
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AMMETERS
AND VOLTMETERS
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Gallenkamp
(c. 1939)
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MINIATURE
PRECISION DIRECT CURRENT AMMETERS AND VOLTMETERS
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Gallenkamp
(c. 1939)
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MINIATURE
PRECISION DIRECT CURRENT AMMETERS AND VOLTMETERS
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Gallenkamp
(c. 1939)
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AMMETERS
AND VOLTMETERS. Gravity instruments, for D.C. or A.C.
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Gallenkamp
(c. 1939)
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AMMETERS
AND VOLTMETE
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Gallenkamp
(c. 1939)
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DEAD-BEAT
PORTABLE INSTRUMENTS.
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Gallenkamp
(c. 1939)
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The
“ALLTEST” Instrument
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Gallenkamp
(1956)
|
Anmeter
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Gallenkamp
(1956)
|
Anmeter
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Gallenkamp
(1956)
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Voltmeter
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