Abstract

This paper describes a new piece of apparatus for obtaining an accurate table of time and distance of a freely falling body; by the use of counterweights, the device serves as an accurate Atwood machine to check Newton’s Second Law of Motion.

© 1928 Optical Society of America

Apparatus for Studying Newton’s Second Law

Peter L. Tea
J. Opt. Soc. Am. 18(4) 360-364 (1929)

A New Registering Photodensitometer*

Elmer A. Harrington
J. Opt. Soc. Am. 16(3) 211-222 (1928)

Free Fall Apparatus

Leo Behr and F. W. Reynolds
J. Opt. Soc. Am. 13(2) 213-216 (1926)

An Improved Coordinator1

R. A. Castleman
J. Opt. Soc. Am. 16(4) 287-292 (1928)

The “Ultramicrometer”, A New Instrument for Measuring Very Small Displacement or Motion, and Its Various Applications1

Juichi Obata
J. Opt. Soc. Am. 16(6) 419-432 (1928)