107301-01
Forbes, James D(avid).
On the theory and construction of a seismometer, or instrument for measuring earthquake shoks, and other concussions.

Edinburgh, Grant, 1841. - (25 x 20,5 cm). SS. (217)-228. Rückenbroschur. (Sonderdruck aus: Transactions of the Royal Society of Edinburgh).

Erste Ausgabe im sehr seltenen Sonderdruck. - "In 1839, however, a series of small earthquakes began near Comrie, in Perthshire, Scotland.... A direct result of the Comrie earthquakes was the establishment of a Special Committee of the British Association for the Advancement of Science, the purpose of the committee being to obtain 'instruments and registers to record shocks in Great Britain' (Milne, 1842). The most significant instrument resulting from the committee's work was an inverted-pendulum 'seismometer', designed by James Forbes... (He) was probably the first to attempt explicitly to give a seismological instrument a 'long' period... Forbes was the first to describe mathematically the behavior of a seismic instrument in an 'earthquake'" (Dewey & Byerly. Early History of Seismometry). - Gut erhalten. - DSB 5, 68; Darmstaedter S. 455