M C Stewart
I know very little about M C Stewart except that they were a manufacturer of wind instruments and were located in Arlington, Massachusetts. They were still in business as of the 1980s.
From 1937, a wind instrument catalog from M C Stewart is available below (18 pages):
Below is their catalog of wind instruments (and a rain guage) from 1940 (24 pages).
From 1984, below is an article evaluating a M C Stewart anemometer (11 pages):
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