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Article PDF first page preview
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.
R. R.
McMath
and
A. K.
Pierce
,
Sky and Telescope
20
,
132
(
1960
).
4.
W. F.
Davis
,
Sky and Telescope
29
,
180
(
1965
).
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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