Testing of timepieces.
Subtitle: Issued June 18, 1931.
Contributors: United States. National Bureau of Standards.
Series: United States. Bureau of Standards. Circular,; no. 392
Publisher: U.S. Govt. Print. Off.
Published: 1931
Place of publication: Washington
Language: eng
Number of pages: 24
Subjects: Clocks and watches.; Time -- Systems and standards.
Notes: At head of title: U.S. Department of Commerce. R.P. Lamont, Secretary. Bureau of Standards. George K. Burgess, Director ...
"Prepared by Ralph E. Gould, Chief, Time section."--p. 1.
"Supersedes Circular no. 51."