oscillator, W.E. type 2B
Dateearly 20th Century
Inventory NumberRS0155
ClassificationSignal Generator
Subject
Maker
Western Electric Company
1869 - 1995
Cultural Region
Dimensions26 x 32 x 18 cm (10 1/4 x 12 5/8 x 7 1/16 in.)
Material
DescriptionA Western Electric-Cruft 2B signal generator-oscillator with bakelite knobs mounted in a wooden box with a leather strap.
Signedfront plate: Western Electric / MADE IN U.S.A.
FunctionPossible function: In order to employ such a system, it is essential that the telephone subscriber installation include equipment capable of generating the sixteen signalling combinations under the control of the telephone subscriber Also from the system standpoint, several requirements are imposed upon the substation calling signal generator To ensure the correctness of each digit, it is essential that the signal generator oscillator be stable in each of the several signal frequencies Additionally, since the digit signals appear in the form of a pair of frequencies received simultaneously, it is highly desirable that the two frequency components have a predetermined voltage relationship, preferably that they be equal Further, in order to facilitate detection of the signal components, it is desirable that they have a substantially square envelope.
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Historical AttributesCruft
William J. Murdock Company
Date: 1910-1950
Object number: RS0163
Western Electric Company
Date: early 20th Century
Object number: RS0146
Western Electric Company
Accessories: 2 small keys.
Object number: RS0127
