Page:Philosophical Transactions - Volume 004.djvu/50

 ''well as elsewhere being not well versed in the ordering and managing of that Instrument: We though, it might be no un-acceptable service, to make known such Directions, as may teach the Use thereof at Sea. Which we shall doe by now giving you our Translation of those instructions, which some yeares since were made publick by tho Worthy M. Christian Hugens of'' Zulechem, in the Belgick Tongue, as they have been since altered or rather enlarged by two other Eminent Members of the R. Society.

Hose, that intend to make use of Pendulum-watches at Sea, must have two of them at least; that, if one of them should by mishap or neglect come to stop, or (being by length of time become foul) need to be made clean there may likely always remaine one in motion.

The Person, to whom the Care of these Watches shall be committed, is-to informe himself from the Watch-maker or some other, so as to understand the inward parts of the Watches, the manner of winding them up, and how to set the Indexes, or Hands having the hours, minutes and seconds, &c.

The Watches on Ship-board are to be hung in a close place, where they may be freest from moisture or dust, and out of danger of being disorder'd by knocking or touching.

Before the Watches be brought on ship-board, 'tis convenient, they be adjusted to a middle or mean day (of which more in the next Section:) the use of them being then most easy, it being little or no trouble to the Watchmakers, when they have one that is set Iust, to set others accordingly: But yet, if time or convenience so to doe should happen to be wanting, they may notwithstanding be used at Sea with the like certainty, provided you know, how much they goe too fast or too slow in 24. hours, as is directed in the next Section. Rh