Rotatone Pulse to Tone Converter shsdparentproduct For use on Model 500

For use on Model 500 phones

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Henry Dreyfuss finally arrived at the form of the new "universal" set

May not be exactly as illustrated

Rotatone Pulse to Tone Converter shsdparentproduct For use on Model 500Introducing Rotatone! Rotary dial phones emit a series of electrical pulses that are used by the equipment at the central telephone office to route the telephone call to the appropriate destination. Dialing a "9", for instance, on a rotary dial will emit nine electrical pulses spaced approximately 1 10 of a second apart. Modern touch to phones accomplish call routing by emitting distinct tones for each number pressed on the keypad, and it is the tones