No coin nor oath required. For personal study only.
Definitions and tables of ~quivalents of the customary weights and measures of the United States and the metric system are included in Miscellaneous Publication MI2I, released last month.
This compilation supersedes Bureau of Standards Circular C47, issued in I9I 4, which has been out of print for some time. Necessary corrections have been made and the text revised and rearranged. The new publication contains the table of millimeter-inch equivalents formerly printed as a supplement to C47; the chart showing a graphic comparison of screwthread pitches, originally published as Miscellaneous Publication M49; and the metric-English equivalents for athletic events which have heretofore appeared as Letter Circular LC376.
The fundamental equivalents and the definitions of the units are clearly set forth, and the difference between units and standards is briefly explained. The methods adopted for maintaining the standards with the required degree of precision are described.
The tables are arranged for maximum convenience in use, and the paper and type were selected with great care to insure easy reading. An index adds greatly to the utility of the publication.
Copies of MI2I are obtainable from the Superintendent of Documents, Government Printing Office, Washington, D. C., at I5 cents each. A HIGH VERTICAL BROADCAST ANTENNA. RP874 in the April number of the Journal of Research describes experiments made during December, 1934, to determine the relative performances of an inverted L antenna and a high * Communicated by the Director.
π SIMILAR VOLUMES