Circular C74 Radio Instruments Measurements US Dept of Commerce 1937

Radio Instruments and Measurements," a publication by the U.S. Department of Commerce, National Bureau of Standards.

The document is identified as Circular C74.

It was reproduced by the National Technical Information Service (NTIS).

The circular provides information on instruments and measurement methods used in radio work.

Various editions were published, with the second edition issued in 1924 and reprinted in 1937