Issues
Letters to the Editor
To Prevent Misunderstanding
Articles
The origin of cosmic radiation
Cosmic ray research has been among the liveliest and most controversial subjects of pure physics in recent years. At a meeting in England last year the author submitted for discussion a theory that cosmic radiation originated within our own solar system. He explains it here.
Acoustics and modern physics
Early in May, 1949 the Acoustical Society of America held its twentieth anniversary meeting and in recognition of current attitudes grouped its papers functionally. With the main theme “Acoustics and Man,” acoustics was discussed in relation to the arts, to health and comfort, to communications, and to research. This article is taken from an invited paper.
Dangerous currents in the surf
Rip currents, not undertow, can sweep the unwary swimmer seaward. Knowing how to spot these rips, and what to do if caught in a strong one, may help a swimmer save his life.
Books
News and Views
Acoustics and Man
Twentieth anniversary meeting
n Equals One
Semi‐centennial of APS
Automatic Librarian
Rapid selector being tested
Translated from the Russian
Brookhaven compiles guide to periodical literature
Harvard Synchrocyclotron Dedicated
Third largest in operation
A Road to Survival
Conference on resources
Instrument Clinic
Precedes instrument conference
Semiconductors
Conference announced
Correction
Guggenheim grant in physics
Society Activities
New board of governors at Argonne; Chicago Physics Club.