Electric Waves, Being Researches on the Propagation of Electric Action with Finite Velocity Through Space. Authorised English Translation by D. E. Jones. With a Preface by Lord Kelvin.
by HERTZ, Heinrich (1857-1894).
London:: Macmillan, 1893., 1893. 8vo. xv, , 278,  pp.40 figs., index. Original dark green blind- and gilt-stamped cloth; extremities worn, corners showing. Ownership signature of "N. E. Dorsey". Very good. NOAH ERNEST DORSEY'S COPY WITH HIS SIGNATURE - KNOWN FOR HIS CONTRIBUTIONS IN MEASURING THE SPEED OF LIGHT. First edition in English. "Even before Hertz had finished his researches on electric waves, he began to receive international recognition. In 1888 he was awarded the Matteucci Medal of the Italian Scientific Society. In 1889 he won the Baumgartner Prize of the Vienna Academy of Sciences and the La Caze Prize of the Paris Academy of Sciences; in 1890 he won the Rumford Medal of the Royal Society, and in 1891 the Bressa Prize of the Turin Royal Academy. Between 1888 and 1892. . . . / Hertz sought a basic understanding of nature; despite his origins in engineering and despite the fact that he made his major discoveries in an engineering school while teaching electricity, he did not concern himself much with the practical implications of electric waves. Others soon did, however. In the early 1890's the young inventor Guglielmo Marconi read of Hertz's electric wave experiments in an Italian electrical journal and began considering the possibility of communication by wireless waves. Hertz's work initiated a technological development as momentous as its physical counterpart." – DSB VI, pp. 343-349. PROVENANCE: Noah Ernest Dorsey (1873-1959), born Annapolis, Maryland, studied at Johns Hopkins, made an important contribution to the understanding of the speed of light. ". . . the most original method was that used by [E.B.] Rosa and [N.E.] Dorsey in 1907 from the ratio of the electrostatic and electromagnetic electric units, which gave much better precision than any other method at that time." – Lauie M. Brown (et.al.), Twentieth Century Physics, II, p. 1263. [Citing: Edward Bennet Rosa & Dorsey, "The Ratio of the Electromagnetic and Electrostatic Units", Bulletin of the Bureau of Standards, 1907, vol. 3, p. 433]. "Three different techniques have been used to measure the speed of light: 1) time of flight techniques; 2) ratio of electrostatic to electromagnetic units; and 3) frequency and wavelength measurements (2v = c). The first quantitative measurement of c was an astronomical one in which the time of flight of light across the earth's orbit around the sun was measured by ROEMER in 1676. Early time-of-flight terrestrial measurements utilized long accurately-measured base lines and either rotating toothed wheels or mirrors for measuring the time interval. One of the most accurate early measurements of c was an electrostatic to electromagnetic ratio experiment by ROSA and DORSEY C6.331 in 1906." – K. M. EVENSON and F. R. PETERS, "Laser Frequency Measurements, the Speed of Light, and the Meter," p. 357.
(Inventory #: SW1480)
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