Ad: SAID THE ELECTRICAL MOUTH TO THE ELECTRICAL EAR . . . (Feb, 1941)

SAID THE ELECTRICAL MOUTH TO THE ELECTRICAL EAR . . .
“Joe took father’s shoe bench out. She was waiting at my lawn.”

If you were passing through the Bell Telephone Laboratories today you might hear an electrical mouth speaking this odd talk, or whistling a series of musical notes, to a telephone transmitter.

This mouth can be made to repeat these sounds without variation. Every new telephone transmitter is tested by this mouth before it receives a laboratory or manufacturing O.K. for your use.

This is only one of the many tests to which telephone equipment is subjected in the Bell Telephone Laboratories. And there is a reason for the selection of those particular words.

It happens that the sentence, “Joe took father’s shoe bench out,” and its more lyrical companion, “She was waiting at my lawn,” contain all the fundamental sounds of the English language that contribute to the intensity of sound in speech.

Busily at work in the interest of every one who uses the telephone is one of the largest research laboratories in the world. The outstanding development of the telephone in this country is proof of the value of this research. In times like these, the work of the Bell Telephone Laboratories becomes increasingly important.

The Bell System is doing its part in the country’s program of National Defense

BELL TELEPHONE SYSTEM

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