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home, see Royal Commission on Ancient and Historical Monuments and Constructions of Scotland: Fife, Kinross and Clackmannan (Edinburgh: HMSO, 1933), pp.69–87. See also Dutch-style water landscape of Culross (across the Forth of Firth) by John Slezer (1693).

27 Culross, 15 September 1668. Worp, letter 6677.

28 Moray was delayed in Paris, negotiating the terms of Charles II’s return with the French, until summer 1660.

29 See references in G.E. Scala, ‘An index of proper names in Thomas Birch, “The History of the Royal Society” (London, 1756–1757)’, Notes and Records of the Royal Society of London 28 (1974), 263–329. See also M. Hunter, Establishing the New Science: The Experience of the Early Royal Society (Woodbridge: Boydell Press, 1989), p.81.

30 See D.S. Landes, ‘Hand and mind in time measurement: The contribution of art and science’, Notes and Records of the Royal Society of London 43 (1989), 57–69; 61.

31 See L.D. Patterson, ‘Pendulums of Wren and Hooke’, Osiris 10 (1952), 277–321.

32 Huygens was given a commission in Paris 14 March 1661 to convey to Mme Bruce (Veronica van Aerssen van Sommelsdijck) – Oeuvres Complètes 22, p.561.

33 Ibid., pp.569–70.

34 Ibid., p.576.

35 Ibid., p.606.

36 Diary of John Evelyn 3, pp.285–6.

37 24 July 1661. See D. Stevenson, Letters of Sir Robert Moray to the Earl of Kincardine, 1657–73 (Aldershot: Ashgate, 2007).

38 Huygens to Moray, 14/24 June 1661. Oeuvres Complètes 3, p.284.

39 Huygens to Moray, 22 July/1 August 1661. Ibid., p.307.

40 Huygens to Lodewijk Huygens, 31 October/9 November 1662. Oeuvres Complètes 4, p.256.

41 This version of events is confirmed in Hooke’s 1674–75 Cutlerian lecture.

42 A description of this clock is to be found in Huygens’s Horologium Oscillatorium (1673). See M. Mahoney, ‘Christian Huygens: The measurement of time and of longitude at sea’, in Studies on Christiaan Huygens, ed. H.J.M. Bos et al. (Lisse: Swets, 1980), pp.234–70. In an unpublished Cutlerian lecture of 1674–75, rewritten (I believe) around 1678, Hooke describes the various clocks used in these trials.

43 Huygens, Oeuvres Complètes 22, p.606.

44 See Leopold, ‘Christiaan Huygens, the Royal Society and Horology’, p.39.

45 Huygens, Oeuvres Complètes 4, p.278. See also Christiaan to Lodewijk, 18/28 December 1662, ibid., pp.284–5.

46 Bruce to Huygens, 2/12 January 1663. Ibid., pp.290–1.

47 Leopold, ‘Clockmaking in Britain and the Netherlands’, Notes and Records of the Royal Society of London 43 (1989), 159.

48 See Huygens to Moray, 1 December 1662 (n.s.), Oeuvres Complètes 4, pp.274–5, and Huygens to Moray, 10/20 December 1662, ibid., pp.280–1.

49 Moray to Huygens, 9/19 January 1663. Ibid., p.296.

50 Huygens to Moray, 2 February 1663 (n.s.). Ibid., p.304.

51 Bruce to Huygens, 16/26 January 1663. Ibid., pp.301–2.

52 Huygens to Bruce, 9/19 January 1663. Oeuvres Complètes 22, p.593 (this is a letter from the Kincardine papers, so is out of order in the Oeuvres Complètes).

53 See J.H. Leopold, ‘Clockmaking in Britain and the Netherlands’, Notes and Records of the Royal Society of London 43 (1989), 155–65; 159.

54 Moray to Huygens, 19 February/1 March 1663. Oeuvres Complètes 4, p.318.

55 Ibid.

56 This suspicion is confirmed by the fact that Hooke’s evaluation of the Huygens longitude clocks, as recorded in the minutes of the Royal Society in 1665, repeats these criticisms in very similar words.

57 In A Description of Helioscopes and some other Instruments (London: T.R. for J. Martyn, 1676) (conveniently to be found cited at length in Huygens, Oeuvres Complètes 7, pp.517–26), Hooke gives the date of this trial as 1662. In BL Sloane MS 1039, fol. 129v, in his Cutlerian lecture on the subject he recalls the date as March 1664. I am confident that the actual date is March 1663.

58 Conveniently to be found cited at length in Oeuvres Complètes 7, p.519.

59 On 22 December 1665 Pepys recorded in his diary: ‘I to my Lord Brouncker’s and there spent the