Here is the "inside workings" of the automatic telephone, located at the Smithsonian Institution, Wash., being operated by Carl Mitman. The electro magnets do all the work. The current necessary to operate these magnets is supplied by 32 dry batteries located in the box at the left. The motor genera

The latest in electric baseball scoreboards. George Coleman, inventor of Wash., is shown with the mechanism of the new scoreboard

Device takes time signal from pendulum of clock. ingenius apparatus takes a time signal from the pendulum. A clock without mechanical contact and the time thus. accurate to a small fraction of a second variation. day. This device was invented by R.E. Gould, Chief of Time Section of the

Telephone machinery?

G.M. Clemence Ast. Astronomer file records from the reorder. On the right is the time signal transmitting clock connected by direct wire to Arlington and Annapolis. All signals are broadcast from there and also from San Francisco to Honolulu and Balboa

Colored radio recorder is latest in radio receivers. E.B. Judson of the Bureau of Standards and his two colored radio recorder, automatically recording signals in two colors, red and black. This automatic receiver is capable of receiving signals from American or European stations

New fathometer used at full speed. Washington, D.C., May 7. Dr. Herbert Grove Dorsey of the U.S. Coast and Geodetic Survey has invented an instrument to secure the precise measurement. The machine sends a sound, pitched so high that it is above audibility, traveling thru the water a known speed, the

Dr. D.C. Bardwell, of the Research Lab. of the U.S. Bureau of Mines, collecting gaseous radium emanation. The radium is in the little safe at the right. Collections are made at intervals of from 4 to 10 days. The gas is drawn off under vacuum and purified by a liquid air refrigeration. The purified

U.S. Chief Signal Officer (G.S.Gibbs?) inspects new radio equipment for talking to Aviators in flight. The new aircraft-radio equipment designed by both the Signal Corps of the War Department permits of both radiotelephone and radiotelegraph communication, sending, receiving, at the same time. The a