RARE! "Physicist" Harlan True Stetson Signed Letter Dated 1926 Todd Mueller COA

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Up for auction a RARE! "Physicist" Harlan True Stetson Signed Letter Dated 1926.  This item is authenticated By Todd Mueller Autographs and comes with their certificate of authenticity.
ES-2577
Harlan True Stetson
(1885–1964) was an
American
astronomer
and
physicist
. He earned a
B.S.
from
Brown University
in 1912, a
M.A.
from
Dartmouth College
, then a
Ph.D.
at
Harvard University
in 1915. His
thesis
was titled,
On an Apparatus and Method for Thermo-Electric Measurements for Photographic Photometry
. Stetson joined Dartmouth in 1918 to teach
physics
, then moved to Harvard where he taught astronomy until 1929. He then became the director of the
Perkins Observatory
in
Delaware, Ohio
. In 1936 he joined the
Massachusetts Institute of Technology
. He directed the MIT Cosmic Terrestrial Research Laboratory from 1940 until 1950, and performed research into the relationship between the cosmos and the Earth. His studies included
sunspots
, the Earth's crust, and the propagation of
radio
waves.The crater
Stetson
on the Moon is named in his honor.
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