4f«; To remar fcurioufly the Scituation, Figures,, 
(yc. of all dangerous %ocks . Sands , Chan- 
nels ^ Entries, and Courfes of Tfivers, and all 
difficult Tajfages and Courfes in all places ■ to 
meafure and defcribe the fame Exactly , their' 
distances, hearings, &c. As alfo the Tro- 
fpeBs of remarkable (fioafts , Tromontories, 
Torts, Iflands, (yc. in the fame manner • 
and make Draughts, Tlots,and EAdaps of 
them, mth their Longitudes , Latitudes , 
Scales, eye. and all Te aeons , Tuoyes, 
Landmarks, Light-houfes , (yc. which ferve 
for directing the Courfe of Ships through nar- 
row Channels , over Tars and ‘Bankas , into 
Tfvers, Torts, Hayes, (yc. And- to- found 1 - 
Tffiths near all Coajls, in all fallow T laces,, 
Toads, (yc. 
f. To found the deepejl Seas without a Line, by 
the help of an Injlrument , reprefented by 
Figure i. 
T O perform thjs,take a Globe of Firr, or Maple, or other light 
wood, as A, let it be well fecured byVernifh, Pitch, orother- 
wife, from imbibing Water, then take a piece of Lead or Stone, 
D, conftderably heavier, than will fiak the Globe : Let there be a 
Y ~~ lon g 
