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double plate triode

double plate triode

Westinghouse Electric & Manufacturing Company
after 1922
double unit string oscillograph, type 338-DO

double unit string oscillograph, type 338-DO

General Radio Company
1928-1932
electron oscillograph and Bedell sweep circuit

electron oscillograph and Bedell sweep circuit

General Radio Company
c. 1935
GenRad model 1971-9601, 1-inch ceramic microphone

GenRad model 1971-9601, 1-inch ceramic microphone

General Radio Company
circa 1984
GE type 1231-B amplifier and null detector

GE type 1231-B amplifier and null detector

General Radio Company
circa 1948
GR custom type 100-4D decade condenser

GR custom type 100-4D decade condenser

General Radio Company
c. 1939
Green wooden storage box containing meters and one multiplier for Weston Model 2

Green wooden storage box containing meters and one multiplier for Weston Model 2

General Radio Company
GR Super-Heterodyne radio receiver

GR Super-Heterodyne radio receiver

General Radio Company
1925
GR tuning coil

GR tuning coil

General Radio Company
circa 1915
GR type 101-L variable air condenser

GR type 101-L variable air condenser

General Radio Company
circa 1915
GR type 101-L variable air condenser

GR type 101-L variable air condenser

General Radio Company
circa 1916
GR type 101-L variable air condenser

GR type 101-L variable air condenser

General Radio Company
circa 1915
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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