. Bulletin - United States National Museum. Science. phoric clock, the wcitjlu clrixc, and a most curious pcrpclual-motion dfvice, the mercury wheel, used as an escapement or regulator. The Alfonsine book on clocks contains descriptions of five devices in all, four of them being due to Isaac b. Sid (two sundials, an automaton water-clock and the present mercury clock) and one to Samuel ha-Levi Adulafia (a candle clock)âthey were probably comixjsed just before ca. 1276-77. The niercur\- clock of Isaac b. Sid consists of an aslroialjc dial, rotated as in the anaphoric clock, and fitted with 30 l
. Bulletin - United States National Museum. Science. phoric clock, the wcitjlu clrixc, and a most curious pcrpclual-motion dfvice, the mercury wheel, used as an escapement or regulator. The Alfonsine book on clocks contains descriptions of five devices in all, four of them being due to Isaac b. Sid (two sundials, an automaton water-clock and the present mercury clock) and one to Samuel ha-Levi Adulafia (a candle clock)âthey were probably comixjsed just before ca. 1276-77. The niercur\- clock of Isaac b. Sid consists of an aslroialjc dial, rotated as in the anaphoric clock, and fitted with 30 leaf-shaped gear teeth (see fie;. 13). perpetual-motion devices found in the medieval European tradition and also in the texts associated with Ridwan, which we shall next examine. It is of the greatest interest to our theme that the Islamic contributions to horoloi^y and perpetual motion seem to form a closely knit corpus. A most important series of horological texts, including those of Ridwan and al-Jazari, have licen edited by Wiede- mann and ^ Other Islamic texts give versions of the water clocks and automata of Archimedes and of Hero and Philo of .* In at least three cases -â ' these texts are found also associated with texts. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
