Georgetown University Seismological Observatory installs only Galitzin horizontal seismographs on this side of the Atlantic. The only one of their type on this side of the Atlantic Ocean, the Galitzin Horizontal seismographs have just been installed at the Georgetown University Seismological Observa

Why is an Earthquake" Washington, D.C., Dec. 17. The old question "why is an earthquake," and many other geological mysteries important to man, are being probed by scientific gadgets such as the two pictured here at the Geological Laboratory of the Carnegie Institute. The scientists work and apparat

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

You have heard. Sollenburger over the radio. time signals from the U.S. Observatory at Wash. Apparatus is one of the most powerful in the world

Naval Observatory tran. clock, switchboard & chronograph time rec. *Abstract/medium:; 5 x 7 in. or smaller

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

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

NAVAL OBSERVATORY. TIME BROADCASTING INSTRUMENTS

Standard clock, Naval Observatory