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July 1950

Volume 3, Issue 7

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Guidance devices for the blind

Franklin S. Cooper
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A blind person needs more than an aid that will work—he needs something he can use. This article surveys approaches and problems.

Hazards of common solvents

Harriet L. Hardy
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Toxic, perhaps for the same reasons that make them such good solvents, benzol, carbon tetrachloride, and several other reagents are commonly and often carelessly used in almost all laboratories. Physics Today presents another in a series of articles dealing with common laboratory substances which must be handled with care.

Neutrons as waves and particles

E. O. Wollan and C. G. Shull
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Indifferent to the charge of a nucleus or its electrons, neutrons can penetrate where charged particles can not. Their use to probe the structure of matter is opening up the promising new field of neutron diffraction.
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Worlds in Collision

Immanuel Velikovsky and Donald H. Menzel, Reviewer
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Modern Science and Its Philosophy

Philipp Frank and David Hawkins, Reviewer
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Books Received

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Herman Shaw

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Helmut L. Bradt

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Ruric C. Mason

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Roy W. Chesnut

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Calendar of Events

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Whereabouts

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Institute Doings

Henry A. Barton
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Pale Orange to Bluest Blue

W. E. K. Middleton
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Luminescent Counting

Frederick Seitz
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‐‐escence

Gorton R. Fonda
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Nuclear Emulsions

F. Reines
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Geomagnetic Cosmic Ray Effects

H. V. Neher
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Polystyrene, Warm and Cool

P. J. Flory
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The Polystyrene Molecule

B. H. Zimm
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New Spectrometer

Joseph A. Bruner
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Mathematical Biophysics

A. Rapoport
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For an Informed Public

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How should our nuclear wealth be spent?

Accelerating

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More big machines

V's and Dogs' Hind Legs

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Two new particles

The Dineutron

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Los Alamos may have found it

Metamorphosis

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Radioactive decay of the neutron

International Conferences

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Heat transmission; Spectroscopy.

New British Journal

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Operational research quarterly

Grants and Awards

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Research Corporation; A. G. Worthing Award; Physics Today doubles.

Fellowships Offered

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Shell Oil; Sigma Delta Epsilon.

Not Exempt

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Fellowship tax

Cornell Summer Course

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The electron microscope

Society Activities

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Sigma Pi Sigma
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