Meddelelser 2008 - Ole Rømers Venner

Meddelelser 2008 - Ole Rømers Venner

" Letter dated 24 December 1665; CEuvres Complåtes, V, 549.


See CEuvres Complåtes, XVIII,48l498.

o' G*r"t Complåtes, XVIII,497, Figure 16.

" CEurr"t Complåtes, VII,408-4I6.

t' I ugree with Leopold that, since we have only Huygens'version of this controversy,

Thuret's contribution probably may have been larger than suggested; J.H. Leopold,

'Christiaan Huygens and his instrument makers', in: Sndies on Christiaan Huygens,

edited by H.J.M. Bos et a/. (Lisse, 1980), 228.

nn Grrrres Complåtes, VII,498.

oi CE*re, Complåtes, VII,4l9.

ou Gwres Complåtes, VII,425.

ot Letters dated l5 and 24 May 1975; (Euvres Complåtes, VIl, 462 and 464.

ot Letter dated 7 October 1675; CEuvres Complåtes, VII, 509.

nn Letter dated l2 October 1675; (Euvres Complåtes, Vll, 510.

to Robert Hooke himself wrote in his diary: 'Zulichems [= Huygens] spring not worth

a farthing'(February 20,1675, Old Style); Diary of Robert Hoolee, edited by H.W.

Robinson and W. Adams (London, 1935), 148. See for a quite different application of

the balance spring by Hooke page l5l.

5' L"tter dated 9 February 1675; (Euvres Complåtes, VII, 405.

t' G*r", Complåtes, VII, 542.

ti G*r", Complåtes, VlI, 477 .

to Letter dated l0 August 1675; CEuvres Complåtes, VII, 489.

5t Letter to H. Justel dated I May 1675 CEuvres Complåtes, VII, 456.

'u Dated l5 August 1679; (Euvres Complåtes, VIII, 197.

" Letter to J. Gallois dated I October 1682; (Ewres Complåtes, VIII, 394.


Guurer Complites, XVI[, 167 and XVlll, I l4-l l7; see forthe cooperation with

Alexander Bruce (?- 168l ) in the tests of 16624 J.H. Leopold (note 60).


The classical source fbr the history of this development is: R.T. Gould, Marine

Chronometer - Its History and Development, (London, 1923 and reprinted in later

years). An excellent recent survey with a wider scope is The Quest for Longitude,

edited by W.J.H. Andrewes, (Cambridge, Mass., 1996).


Guure, Complåtes, XVUI, 527. See J.H. Leopold,'The longitude timekeepers of

Christiaan Huygens'in W.J.H. Andrewes (note 59), 102-l14.


S." W.J.H. Andrewes,'Even Newton Could Be Wrong: The Story of Harrison's

F'irst Three Sea Clocks, in W.J.H. Andrewes (note 59), 190-191.


Quoted in R.T. Gould (note 59), 1960 edition, 5l and 83.

u''lf t"e contrast this marvellous machine [Le Roy's watch] with No. 4, which, in its

own way, is equally wonderful, Le Roy's superiority as a horologist is evident.

Harrison took the escapement, balance, and general arrangement of the ordinary

watch of his day, and by fitting a remontoire and maintainer, an automatic regulator,

and diamond pallets, aided by high-numbered wheels and pinions and lavish jewelling,

he compelled it to become an efficient timekeeper. Le Roy attacked the problem

from an entirely different standpoint, and obtained his results not by nullifring

detbcts, but by eliminating them. The difference in their machines is fundamental -


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