American Decades
Deaths
Frank Stephen Baldwin, 86, inventor of Baldwin calculator and other calculating machines, 8 April 1925.
Edward E. Barnard, 66, first astronomer to combine the camera and the telescope, taking photographs of plants, comets, nebulae, and the Milky Way, 6 February 1923.
Alexander Graham Bell, 75, inventor of the telephone, 2 August 1922.
Emile Berliner, 78, inventor of the microphone, the disk phonograph record, and the first workable helicopter, 3 August 1929.
Hezekiah Bissel, 93, the only engineer with the Union Pacific Railroad to see the construction of the trans-continental railway from start to finish (1862-1869), 23 June 1928.
Bertram B. Boltwood, 57, chemist and physicist who researched the properties of the radioactive elements uranium and thorium, discovering ionium, an isotope of thorium, and pioneering radioactive dating of geological strata, 15 August...
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1920's Science and Technology
