Playing a tune for a telephone number
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:•: •"/• •'.' • • ^ ' \ " ,,v - ••^J^Z"^^'^ . -^ • ·, .v.^^>i,·.;^. ; ."*«-.. * * Λ6ονβ /s ine Bell System's new "musical keyboard." Insert shows the digits of telephone numbers in musical notation, Just as they are sent across country. Playing a tune for a telephone number Before you talk over some of the new Bell System long distance circuits, your operator presses keys like those shown above, one for each digit in the number of the telephone you are calling. Each key sends out a pair of tones, literally setting the number to music. In the community you are calling, these tones activate the dial telephone system, to give you the number you want. It is as though the operator reached clear across the country and dialed the number for you. This system, one of the newest developments of Bell Telephone Laboratories, is already in use on hundreds of long distance lines radiat- ing from Chicago, Cleveland, 3N T ew York, Oak- land and Philadelphia, and between a number of other communities. It will be extended steadily in other parts of the country — a growing example of the way Bell Telephone Laboratories are ever finding new ways to give you better, faster telephone service. BELL TELEPHONE LABORATORIES Exploring and inventing, devising and perfecting, for continued improvements and economies in telephone service <^$& Sg£ VOLUME 2 8, N O . 6 » » FEBRUARY 6, 1 9 5 0 379
Transcript of Playing a tune for a telephone number
:•: •"/• •'.' • •^ ' \" , , v - • • ^ J ^ Z " ^ ^ ' ^
. -̂ • ·, . v .^^>i , · . ;^ . ; ."*«-..
* *
Λ6ονβ /s ine Bell System's new "musical keyboard." Insert shows the digits of telephone numbers in musical notation, Just as they are sent across country.
Playing a tune for a telephone number
Before you talk over some of the new Bel l System long distance circuits, your operator presses keys like those shown above, one for each digit i n the number of the telephone y o u are call ing. Each key sends out a pair of tones, literally setting the number to music.
In the community you are calling, these tones activate the dial telephone system, to give you t h e number you want. It is as though the operator reached clear across the country and dialed the number for you.
This system, one of the newest developments of Be l l Telephone Laboratories, is already i n use on hundreds of long distance lines radiating from Chicago, Cleveland, 3NTew York, Oakland and Phi ladelphia, and between a number of other communities.
It wil l be extended steadily i n other parts of the country — a growing example of the way Bell Telephone Laboratories are ever finding new ways to give you better, faster telephone service.
B E L L T E L E P H O N E L A B O R A T O R I E S Exploring and inventing, devising and perfecting, for continued improvements and economies in telephone service
<^$& Sg£
V O L U M E 2 8, N O . 6 » » F E B R U A R Y 6, 1 9 5 0 379
