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March 1950

Volume 3, Issue 3

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Astrophysicists watch the Sun

Donald H. Menzel and Catherine B. Wyatt
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The coronagraph, with an artificial moon that permits observations of the sun as though it were in eclipse, is providing a rapid accumulation of data which are raising more questions than they have answered.

Living matter and physical laws

John R. Reitz and Conrad Longmire
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The biologist is perhaps as skeptical of the help the physicist can offer the life sciences as the physicist is confident that he has something to offer. But physical concepts are being applied to the study of life both with humility and with prospects for progress.

Microwaves and sound

Winston E. Kock
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A recent development shows that obstacle arrays, modeled after the periodic structure of crystals, refract and focus not only electromagnetic waves, but sound waves as well.
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Letters to the Editor

Klaus Fuchs and Edward M. Corson
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Cosmic Radiation

R. B. Brode, Reviewer
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Luminescent Materials

G. F. J. Garlick and Frederick Seitz, Reviewer
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Elements of Sound Recording

John G. Frayne, Halley Wolfe, and O. Sandvik, Reviewer
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Books Received

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Conference in Amsterdam

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Solid State Symposium

R. Brill and Hartmut Kallman
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Ewald to head physics at Brooklyn Poly

AAAS Symposium On Physics

J. Bardeen and E. P. Ney
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Semiconductors and ferroelectrics; Electrons, cosmic rays, and flash bulbs.

Microscopy With X‐Rays

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Experimental instrument models described

High Flux

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Chalk River isotopes available

Society Activities

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OSA national officers elected

Fellowships Offered

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MIT Summer Program
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Institute Doings

Henry A. Barton
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Tracks and Stars

W. A. Shurcliff
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New Electron Microscope

R. S. Page
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Bubble

H. A. Wilson
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Faraday Effect

C. E. Waring
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Pressure Balance

C. A. Swenson
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Integrating Counters

E. P. Gross
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Light Intensity

Herbert B. Keller
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High Speed Oscillography

G. G. Kelley
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Mathematical Biophysics

A. Rapoport
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Whereabouts

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Calendar of Events

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