. Bulletin - United States National Museum. Science. Figure 5.âPlate of Salzblrg Anaphoric Clock, a reconstruc- tion (see footnote 14) based on a pliotograpli of the remaining fragment. {Courtesy of Oxford University Press.) â ^-~~. TV.;,, Parts of two such discs from anaphoric clocks have been found, one at Salzburg '' and one at Grand in the Vosges,'' both of them dating from the 2nd century A. D. Fortunately there is sufficient evidence to reconstruct the Salzburg disc and show- that it must have been originally about 170 cm. in diameter, a heavy .sheet of bronze to be turned by the small p
. Bulletin - United States National Museum. Science. Figure 5.âPlate of Salzblrg Anaphoric Clock, a reconstruc- tion (see footnote 14) based on a pliotograpli of the remaining fragment. {Courtesy of Oxford University Press.) â ^-~~. TV.;,, Parts of two such discs from anaphoric clocks have been found, one at Salzburg '' and one at Grand in the Vosges,'' both of them dating from the 2nd century A. D. Fortunately there is sufficient evidence to reconstruct the Salzburg disc and show- that it must have been originally about 170 cm. in diameter, a heavy .sheet of bronze to be turned by the small power provided by a float, and a large and impressive device when working (see fig. 5). " First publisiied by O. Benndorf, E. Weiss, and A. Rchm, Jahreshejle des oslerreichischen archdologischen Instilut in Wicn, 1903, vol. 6, pp. 32-49. I have given further details of its constiuclion in A history oj technology, ed. Singer, Holmyaid, and flail, 1957, vol. 3, pp. 604-605. '^ L. Maxe-Werly, Mi-moires de la Sociite jVationale des Ari- tiquaires de France, 1887, vol. 48, pp. 170-178. PAPER 6: CLOCKWORK, PERPETUAL MOTION DEV 471274â59 7 Literary accounts of the anaphoric clock have been analyzed by Drachmann; there is no evidence of the representation of planets moved cither by hand or by automatic gearing, only in the important case of the sun was such a feature included of necessity. .\ model "sun" on a pin could be plugged in to any one of 360 holes drilled in at equal intervals along the band of the ecliptic. This pin could be moved each day so that the anaphoric clock kept step with the seasonal variation of the limes of sunrise and sunset and the lengths of day and night. The anaphoric clock is not only the origin of the astrolabe and of all later planetary models, it is also the first clock dial, selling a standard for "clockwise" rotation, and leaving its mark in the rotating dial and stationary pointer found on the earliest time- ICES, AND THE CO
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