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3 stage audio amplifier

3 stage audio amplifier

General Radio Company
60° fused quartz prism

60° fused quartz prism

Theodore Lyman IV
circa 1920
ACME Reflex Acmefone radio receiver

ACME Reflex Acmefone radio receiver

ACME Apparatus Company
1923
Acme type Y-1 vacuum tube radio detector

Acme type Y-1 vacuum tube radio detector

ACME Apparatus Company
1920
alternating current motor demonstration (?)

alternating current motor demonstration (?)

Central Scientific Company
ca. 1910-1940
AMRAD type 2797 grounded short gap with original box

AMRAD type 2797 grounded short gap with original box

American Radio and Research Corporation
AMRAD type D-1 medium wave coupler

AMRAD type D-1 medium wave coupler

American Radio and Research Corporation
1921
AMRAD type D-1 medium wave coupler

AMRAD type D-1 medium wave coupler

American Radio and Research Corporation
1921
AMRAD type D-1 medium wave radio coupler

AMRAD type D-1 medium wave radio coupler

American Radio and Research Corporation
1921
AMRAD type D-1 no. 2333 medium wave coupler with original box

AMRAD type D-1 no. 2333 medium wave coupler with original box

American Radio and Research Corporation
1921
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
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