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

Standard clock, Naval Observatory

NAVAL OBSERVATORY. TIME BROADCASTING INSTRUMENTS

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

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

Setting the clocks hands by radio. U.S. Dunmore Bureau of Standards who adopted clock to radio control

Naval observatory, Washington, D.C. *Abstract/medium:; 8 x 6 in.

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