Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 273
all as pos-sible. In 1890, ProfessorT. C. Mendenhall, thensuperintendent of the UnitedStates Coast and GeodeticSurvey, designed a pendulumone fourth the length of thosepreviously used, and of ad-mirable precision. Afterward pendulums were built of dimen-sions further reduced to about two and… … Riefler clock. HEAT 225 been employed on the summits of high mountains, includingPikes Peak: their indications agree well with those of the largerand somewhat cumbersome apparatus previously used. Much the most convenient means of measuring temperature isthe common glass tube filled with mercury.…
Inventions · Inventors
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