This is the NEMS-Clarke Equipment Section of
The Broadcast Archive

Maintained by:
Barry Mishkind - The Eclectic Engineer
Last updated 3/28/11


Silver Spring, MD

NEMS-Clarke, aka Vitro Corporation, built monitoring and test equipment for RCA - and marketed the product on their own as well.

The original companies NEMS - National Electric Machine Shop (founded 1899 as National Electrical Supply Co) - and Clarke Instruments (founded 1940), merged in 1951 as NEMS-Clarke. NEMS was manufacturing radio parts, and Clarke designed telemetry and special purpose receivers, largely for the Defense Department.

In 1957, Vitro bought NEMS-Clarke and moved it to Silver Spring, MD. In 1981, Vitro was acquired by Penn Central Corp.

In 19xx, Potomac Instruments bought what was left of NEMS-Clarke and serviced the products, until parts ran out. At last report, PI no longer even offers calibration for NEMS-Clarke products, however, some information may be available at PI.

  107-A Field Intensity Meter
  120-D Field Intensity Meter
120-E  Field Intensity Meter






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We have used many sources, including FCC files, university lecturers, historical publications and more, and have tried to be as accurate as possible, not repeating many of the myths of the industry (such as the Uncle Don Story) nor histories "manufactured" by promotion departments. However, I am not perfect, and may well have overlooked something. If you do see an error or omission, please let me know.

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        Barry Mishkind