UNITED STATES DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

Units and Systems of Weights and Measures

Their Origin, Development, and Present Status

COMMERCE

UNITED STATE

3

OF AMERICA

A. V. Astin, Director

National Bureau of Standards Circular 570

Issued May 21, 1956

For sale by the Superintendent of Documents, U. S. Government Printing Office, Washington 25, D. C.