REFERENCES
1.
J. Strong, Procedures in Experimental Physics (Prentice‐Hall, Inc., New York, 1938), p. 343.
2.
L. Bell, The Telescope (McGraw‐Hill Book Co., New York, 1932), pp 110–114.
3.
4.
5.
The constancy of the frequency maintained by the Consolidated Edison Co. of New York corresponds to a maximum time variation of 1 sec during a 12‐h period.
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© 1968 The American Institute of Physics.
1968
The American Institute of Physics
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