. Bulletin - United States National Museum. Science. Figure 10. Henry Kater 11777- [835) I nglish army offii ei and phj ni ist. 1[is 31 ientift gan during his militarj service in where he assisted in the "great tri in ; Returned to En ise ol bad health, and retired in ifii p he pioneered < 1818) in the develop- ment of the convertible pendulum .is .in alternative to the approxima- tion ni the "simple" pendulum foi the measurement of tin- "se\ him in 1819 wen- the basis of] ngli h pi ndulum work. [Photo courtesy National Por- trait Gallery, London.) pendu
. Bulletin - United States National Museum. Science. Figure 10. Henry Kater 11777- [835) I nglish army offii ei and phj ni ist. 1[is 31 ientift gan during his militarj service in where he assisted in the "great tri in ; Returned to En ise ol bad health, and retired in ifii p he pioneered < 1818) in the develop- ment of the convertible pendulum .is .in alternative to the approxima- tion ni the "simple" pendulum foi the measurement of tin- "se\ him in 1819 wen- the basis of] ngli h pi ndulum work. [Photo courtesy National Por- trait Gallery, London.) pendulum was carried out by Borda and Cassini by methods previously described. Bohnenberger in his me 11slii,-" made the proposal to employ a convertible pendulum for the absolute determination ni gravit): thus, he lias received credit for priority in publication. Capt. Kater independently conceived ni the convertible pendulum and was the first to design, construct, and swing one. After his observations with the convertible pendu- lum, Capt. Kater designed an invariable compound pendulum with a single knife edge but otherwise simi- lar in external form to the convertible pendulum"' (fig. 1 ii. Thirteen of these Kater invariable pendu- lums have been reported as constructed and swung al stations throughout the world.*a Kater himself swung an invariable pendulum at a station in London and at various other stations in the British Isles. Capt. Edward Sabine, between 1820 and 1825, made voyages and swung Kater invariable pendulums at stations from the West Indies to Greenland and 2> Collection de memoir es, vol. 4, p. B-74. n Phil. Trans. (1819), vol. 109, p. 337. MJOHN Herschel, "Notes for a History of the Use of [nvariable Pendulums," The Great Trigonometrical Suney of India (Calcutta, 1879), vol. 5. Figure I I . 1 111 Mil Mil Hi VPPROX1MATI the simple pendulum in gravity experiments ended in when Henry [Cater invented the com- pound 1 onvertible pendulum, from w
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