Ralph Belknap Baldwin (June 6, 1912 – October 23, 2010)''Who's Who in America'' arquis 56th edition, 2002. New Providence, NJ: Marquis Who's Who, 2001. was an American

planetary scientist Planetary science (or more rarely, planetology) is the scientific study of planets (including Earth), celestial bodies (such as moons, asteroids, comets) and planetary systems (in particular those of the Solar System) and the processes of their ...

known for his work on

lunar craters Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, all of which were formed by impacts. The International Astronomical Union currently recognizes 9,137 craters, of which 1,675 have been dated. History The wor ...

, beginning in the late 1940s. His book, ''The Face of the Moon'' made the case for the impact nature of lunar craters. He published ''The Measure of the Moon'' in 1963. Prior to his lunar work he was Senior Physicist at Johns Hopkins University's

Applied Physics Laboratory The Johns Hopkins University Applied Physics Laboratory (Applied Physics Laboratory, or APL) is a not-for-profit University Affiliated Research Center, university-affiliated research center (UARC) in Howard County, Maryland. It is affiliated w ...

during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

working on the

Proximity fuze A proximity fuze (or fuse) is a Fuze (munitions), fuze that detonates an Explosive material, explosive device automatically when the distance to the target becomes smaller than a predetermined value. Proximity fuzes are designed for targets such ...

. In 1947 he began working for Oliver Machinery Company. In 1970 he became president of the company and chairman of the board in 1982. He retired in 1984. He died on October 23, 2010.

Early life

Baldwin was born in

Grand Rapids Grand Rapids is a city and county seat of Kent County in the U.S. state of Michigan. At the 2020 census, the city had a population of 198,917 which ranks it as the second most-populated city in the state after Detroit. Grand Rapids is the ...

Michigan Michigan () is a state in the Great Lakes region of the upper Midwestern United States. With a population of nearly 10.12 million and an area of nearly , Michigan is the 10th-largest state by population, the 11th-largest by area, and the ...

. He attended the

University of Michigan , mottoeng = "Arts, Knowledge, Truth" , former_names = Catholepistemiad, or University of Michigania (1817–1821) , budget = $10.3 billion (2021) , endowment = $17 billion (2021)As o ...

, receiving his B.S. in 1934, M.S. in 1935, and Ph.D. in 1937, on the "spectroscopic study of novae". After graduation, he taught astronomy at the University of Michigan,

University of Pennsylvania The University of Pennsylvania (also known as Penn or UPenn) is a private research university in Philadelphia. It is the fourth-oldest institution of higher education in the United States and is ranked among the highest-regarded universitie ...

, and

Northwestern University Northwestern University is a private research university in Evanston, Illinois. Founded in 1851, Northwestern is the oldest chartered university in Illinois and is ranked among the most prestigious academic institutions in the world. Charte ...

from 1935 through 1942. The photographs at the

Adler Planetarium The Adler Planetarium is a public museum in Chicago, Illinois, dedicated to astronomy and astrophysics. It was founded in 1930 by local businessman Max Adler. Located on the northeastern tip of Northerly Island on Lake Michigan in the city, t ...

, where he lectured to earn extra money, sparked his interest in lunar craters. This led to an article in ''

Popular Astronomy Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes. Even though scientific research may not be their primary goal, some amateur astronomers ...

'' in 1942 and later his book ''The Face of the Moon'', in 1949. During

Baldwin helped to develop the radar proximity fuze. He published a history of proximity fuze development in 1980 entitled ''The Deadly Fuze''.

Awards and honors

Baldwin has been honored for each of his three careers. During his work on the radio proximity fuze he was awarded the Army Chief of Ordnance Award and the U.S. Naval Bureau Ordnance Award (1945). In 1947 he was a recipient of the Presidential Certificate of Merit. He was elected a Fellow of the

American Academy of Arts and Sciences The American Academy of Arts and Sciences (abbreviation: AAA&S) is one of the oldest learned societies in the United States. It was founded in 1780 during the American Revolution by John Adams, John Hancock, James Bowdoin, Andrew Oliver, and ...

in 1980. In planetary science he has been awarded the Barringer Medal (2000),

Leonard Medal The Leonard Medal honors outstanding contributions to the science of meteoritics and closely allied fields. It is awarded by the Meteoritical Society. It was established in 1962 to honor the first President of the Society, Frederick C. Leonard. ...

(1986), G.K. Gilbert Award (1986), and the

J. Lawrence Smith Medal J. Lawrence Smith Medal is awarded every three years by the National Academy of Sciences for investigations of meteoric bodies. The medal is in honor of its namesake, the American chemist and meteoriticist, J. Lawrence Smith. Recipients Sour ...

(1979) The Ralph B. Baldwin Award by the Wood Machinery Manufacturers of America was established in his honor.

References

External links

Oral History interview transcript for Ralph Belknap Baldwin on 25 October 1989, American Institute of Physics, Niels Bohr Library and Archives
{{DEFAULTSORT:Baldwin, Ralph Belknap 1912 births 2010 deaths American astronomers Fellows of the American Academy of Arts and Sciences Northwestern University faculty People from Grand Rapids, Michigan Planetary scientists University of Michigan College of Literature, Science, and the Arts alumni University of Michigan faculty University of Pennsylvania faculty Barringer Medal winners