San Francisco Public Library

From sundials to atomic clocks, understanding time and frequency, James Jespersen and Jane Fitz-Randolph ; illustrated by John Robb and Dar Miner

"This Dover edition, first published in 1999, is an unabridged republication of the work first published in 1999 as Monograph 155, 1999 edition, by the National Institute of Standards and Technology, a division of the U.S. Department of Commerce. It is a revised edition of the work first published by the National Bureau of Standards in 1977, and reprinted by Dover in 1982"--T.p. verso

2nd rev. ed.

9780486409139

99043755

308 p., ill., maps, 24 cm

49911741