On the Origin of Clockwork, Perpetual Motion Devices, and the Compass

by Derek J. de Solla Price

[24] E. Wiedemann, and F. Hauser, Die Uhr des Archimedes und zwei andere Vorrichtungen, Halle, 1918.

[25] The manuscripts in question are as follows: Gotha, Kat. v. Pertsch. 3, 18, no. 1348; Oxford, Cod. 954; Leiden, Kat. 3, 288, no. 1414, Cod. 499 Warn; and another similar, Kat. 3, 291, no. 1415, Cod. 93 Gol.

[26] H. Schmeller, Beiträge zur Geschichte der Technik in der Antike und bei den Arabern, Erlangen, 1922 (Abhandlungen zur Geschichte der Naturwissenschaften und der Medizin no. 6).

[27] Once more I am indebted to Professor Loren MacKinney and Miss Harriet Lattin (see footnote [11]) for making their collections on Gerbert available to me.

[28] Item 198 in Gunther, op. cit. (footnote [21]). I am grateful to the authorities of that museum for permission to reproduce photographs of this instrument.

[29] Sotheby and Co., London, sale of March 14, 1957, lot 154. The outer rim of the rete has 120 teeth.

[30] The Latin text of the treatise on the Albion, has been transcribed by Rev. H. Salter and published in R. T. Gunther, Early science in Oxford, Oxford, 1923, vol. 2, pp. 349-370. An analysis of its design is given in Price, op. cit. (footnote [22]), pp. 127-130.

[31] Such evidence as there is for the existence and form of the clock is collected by Gunther, op. cit. (footnote [30]), p. 49.

[32] I have discussed this new manuscript source in "Two medieval texts on astronomical clocks," Antiquarian Horology, 1956, vol. 1, no. 10, p. 156. The manuscript in question is ms. 230/116, Gonville and Caius College, Cambridge, folios 11^v-14^v = pp. 31-36.

[33] The Chronicle of Jocelin of Brakelond ..., H. E. Butler (ed.), London, 1949, p. 106.