Abstract

A coordinator assembled from a T-square, a drawing board, two slide rules and certain machined accessories has been developed as an improvement on the simple but useful device previously described. The merits claimed for the present design are (a) compactness, simplicity in operation, accuracy and (b) ease of assembly from apparatus readily and cheaply available.

This paper includes a description of the device and some remarks on its design and use.

© 1928 Optical Society of America

The Vibrations of Tuning-Forks1

Elmer A. Harrington
J. Opt. Soc. Am. 17(3) 224-239 (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)

An Improved Rosa Curve Tracer*

N. E. Bonn
J. Opt. Soc. Am. 17(3) 207-223 (1928)

Free Fall Apparatus, Newton’s Second Law Of Motion

Peter L. Tea
J. Opt. Soc. Am. 17(2) 138-144 (1928)

A Sonic Interferometer for Measuring Compressional Velocities in Liquids: A Precision Method1

A. L. Loomis and J. C. Hubbard
J. Opt. Soc. Am. 17(4) 295-307 (1928)