well as elfetvhere being not well verfed in the ordering und m/t- 
naging of that Inflrument : We thought , it might he no un-ac- 
ceptable fervice y to make known fuch Directions^ as may teach 
the V(e thereof at Sea. Which we Jhall doe by now giveing jou 
cur I'r an flat ion of thofe in ({ructions j which fome yeares fince were 
made fuklick ty the Worthy M. Chriftian Hugtns (/Zulechem, 
in the Belgick Tongue ^ as they have been (mce altered or rather 
enlarged by two other Eminent Members of the R, Society. 
jind they are thefe 5 
I. 
THofe, that intend to make ufe of Pendulum-watches 
at Sea, muft have two of them at leaft that, if one 
of them ftiould by mishap or negkdi come to flop , 
or (being by length of time become foul) need to be made 
clean, there may likely always remaine one in motion. 
The Perfon, to whom the Care of thefe Watches (hall 
be committed, is to informe himfelf from the Watch-maker 
or feme other, fo as to underftand the inward parts of the 
Watches, the manner of winding them up , and how to fet 
the Indexes ^ or Hands hav.ng the hourS3 minutes and fecondsj 
The Watches on Ship-board are to be hung in a clofe 
place, where they may be freeft from moifture or duft, 
and out of danger of being diforder'd by knocking or 
touching. 
Before the Watches be brought on fliip-board^ *tis conve- 
nient, they be adjufted to a middle or mfan day (of which 
more in the next Section: ) the ufe of them being then moft 
©afy, it being little or no trouble to the Watchmakers, 
when they have one that is fet luft , to fet others accordingly: 
But yet, if time or conveniency fo to doe fhould happen to 
be wanting 5 they may not with ftanding beufedatSea with 
the like certainty, provided you know 5 how much theygoe 
too faft or too flow in 24. hours y as is direfled in the next 
Sedion. 
To 
