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20
RADIO AGE for February, 1927
The Magazine of the Hour
Fveryday Mechanics
Accurate Sun Dial
Wide World Photos.
Father Terray, of Assumption College, Worcester, Mass., who has just perfected a unique sun dial which gives extremely accurate readings of minutes of the day as well as hours
Radio Starts Lights
Diagram of the radio-starting of St. Louis' new $8,000,000 lighting project, which was inaugurated December 16. The voice of Mayor Victor J. Miller, picked up by a microphone produced a low-frequency wave from Station KDKA which set in motion the train of automatic operations which illuminated the streets of St. Louis.
No Trouble For This Car
A new innovation in the automobile line is this "Wheel-Cum-Track" combination of automobile and tractor, exhibited at the recent tank demonstration at Camberley, England. The body is that of an ordinary touring car, and the change from to wheels to rack can be made by engine power in less than a minute.
Microphonic Air-Gap
SOON after the invention, by Emile Berliner, of the loose contact transmitter, or microphone, scientists tried to explain its delicate action. That air was a factor in microphonic action was indirectly proved by Berlinger and his assistant W. L. Richards in 1879 when they put a Blake transmitter contact into a tight chamber and pumped the air out. Regularly the normal electric resistance of the contact was reduced on exhaustion and as regularly restored when again admitting air into the chamber.
Recently it occurred to Mr. Berliner to consult Roy M. Allen of Bloomfield, N. J., formerly the President of the New York Microscopic Society and who is very skillful in the making of photomicrographs. Mr. Berliner furnished Mr. Allen with a mounted telegraph key the contacts of which consisted of elongated, conical iron pins, which could be adjusted by a small relay spring. They were fashioned so as to permit the close approach of a high power microscope that had a photographic attachment.
The mounted key could be readily adjusted so that it would by microphonic action transmit the the ticking of a watch and the whirring of its wheels. Mr. Allen's problem consisted in photographing the contact while listening to the ticking of the watch which was transmitted by the delicately adjusted key where an air-gap was supposed to exist; this air-gap Mr. Allen was trying to enlarge and photograph.
The invention of the microphone started with a telegraph key improperly manipulated by Mr. Berliner and it is mentioned in his patent document of April 14, 1877 describing the microphone. The details appear in Frederic William Wile's biography of Mr. Berliner recently published.
We shall be glad to have the comments of our readers on this feature, and the one on science which we are running each month. Are you interested in the pictures? Does the type of news matter give you any needed imformation? Let us hear from you. — Editor.