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By 1917, they sold chemistry sets, which they produced through World War II, in spite of restrictions on materials. Robert Treat Johnson, noting the number of chemistry students at Yale whose interest in the science began with a chemistry set, argued the production of chemistry sets was a "patriotic duty." [5]
Beginning in 1922, A. C. Gilbert made chemistry sets in various sizes. The instruction manuals were co-edited by a Sterling Professor at Yale university and one of his graduate students. [8] [9] Between 1946 and 1966, the company manufactured toy trains called the American Flyer. [10]
Gilbert cloud chamber, assembled An alternative view of kit contents. The lab contained a cloud chamber allowing the viewer to watch alpha particles traveling at 12,000 miles per second (19,000,000 m/s), a spinthariscope showing the results of radioactive disintegration on a fluorescent screen, and an electroscope measuring the radioactivity of different substances in the set.
Porter Chemical Company was an American toy manufacturer that developed and produced chemistry sets aimed as educational toys for aspiring junior scientists. The company's Chemcraft kits were first sold at major retail by Woodward & Lothrop, and appeared soon after at other retailers in the country.
It also produced crafts plaster moulding sets Frog & Owl. [2] Thomas Salter Ltd. was founded in London in 1913, moved to Glenrothes, Fife, and closed in 1992. [3] Chemistry sets from Salter Science included a various number of chemicals, which were numbered, so that the numbers were the same across the sets. Some of the chemicals included were:
CLEP exams are offered at testing centers on over 1,500 college and university campuses, many military installations, and at home with remote proctoring. [9] [10] Most centers charge an administrative or registration fee per student or per test. Fees usually range from $15–40, though they vary among test centers.