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AMRAD type 2611 variometer

AMRAD type 2611 variometer

American Radio and Research Corporation
circa 1921
AMRAD type D short wave variometer

AMRAD type D short wave variometer

American Radio and Research Corporation
1920
AMRAD type D short wave variometer

AMRAD type D short wave variometer

American Radio and Research Corporation
1920-1922
AMRAD type D short wave variometer face plate

AMRAD type D short wave variometer face plate

American Radio and Research Corporation
1920
AMRAD type D short wave variometer with original box

AMRAD type D short wave variometer with original box

American Radio and Research Corporation
1921
AMRAD type D short wave variometer with original box

AMRAD type D short wave variometer with original box

American Radio and Research Corporation
1922
AMRAD type D short wave variometer with original box

AMRAD type D short wave variometer with original box

American Radio and Research Corporation
1922
Betts type W-200 variometer in original box

Betts type W-200 variometer in original box

Betts & Betts Corporation
circa 1920
Clapp-Eastham Blitzen Tuner variometer

Clapp-Eastham Blitzen Tuner variometer

Clapp-Eastham Company
1906-1915
De Forest type R-J variometer

De Forest type R-J variometer

De Forest Radio Telephone & Telegraph Company
1909
"inductometer" variometer

"inductometer" variometer

Leeds & Northrup Company
circa 1920
tuning coil, noiseless tested micro condenser, variometer

tuning coil, noiseless tested micro condenser, variometer

Hearwell Radio Company
ca. 1915-1930
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