. Bulletin. La science. Figure 2.-Un dessin contemporain de Wren's "weatiier réveil." (Photo avec la permission de la Société royale de Londres.) montre un réveil ordinaire auquel est attaché un crayon- exerce rack, adaptée à l'heure du pignon. Une discus- sion de l'horloge "réduction à la pratique" a commencé la participation de Robert Hooke, qui était "chargé" en septembre 1664 pour faire "une horloge à pendule applicables à l'observation de l'évolution de la météo." ^ cet hommage à la réputation de Hooke et de la polyvalence du mécanicien arts à ce moment-a été légèrement optimiste.

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. Bulletin. Science. Figure 2.—A contemporary drawing of Wren's "weatiier clock." (Photo courtesy Royal Society of London.) shows an ordinary clock to which is attached a pencil- carrying rack, geared to the hour pinion. A discus- sion of the clock's "reduction to practice" began the involvement of Robert Hooke, who was "instructed" in September 1664 to make "a pendulum clock applicable to the observing of the changes in the weather." ^ This tribute to Hooke's reputation—and to the versatility of the mechanic arts at this time—was slightly overoptimistic, as 15 years ensued before the clock made its appearance. References to this clock are frequent in the records of the Royal Society—being mainly periodic injunc- tions to Hooke to get on with the work—until its completion in May 1679. The description which Hooke was asked to supply was subsequently found 8 R. T. Gunther, Early Science in Oxford, vol. 6, The Lije and Work of Robert Hooke, pt. 1, Oxford, 1930, p. 196. In 1670, Hooke's proposed clock was referred to as "such a one, as Dr. Wren had formerly contrived" (Gunther, p. 365). among his papers and printed by William Derham as follows: ' The weather-clock consists of two parts; first, that which measures the time, which is a strong and large pendulum- clock, which moves a week, with once winding up, and is sufficient to turn a cylinder (upon which the paper is rolled) twice round in a day, and also to lift a hammer for striking the punches, once every quarter of an hour. Secondly, of several instruments for measuring the degrees 5 William Derham, Philosophical Experiments amd Observations oj . . Dr. Robert Hooke, London, 1726, pp. 41-42 (reprinted in Gunther, op. cit. footnote 8, vol. 7, pp. 519-520). This description, dated December 5, 1678, predates the Royal Society's request for a description (Gunther, op. cit. footnote 8, p. 656) by four months, but the Society no longer has any description of the

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