'Tis good to have two GlaiTes thus prepared, otie for 
a flrcrig Sun ^ the other lefs darkened, tor the Sun be- 
hind a thin Gloud, M'lflr, or &i\ 
With oneofthefe Glafies held behind, or before the 
Sight a, b. you may plainly fee the Sun pafs. 
To imitate the afore fa? d Injlrument in a 'journey^ or 
vphere- ever yon come. 
Inftead of an intire Inftrument, prepare only two 
Sights (as in Fig. 2,} with Perforations as before. Let 
thef? Sights be nailed or fere wed down, upon the tops 
of two Stakes at 1. 1, fo as to turn ftifBy upon them. 
The Plumb-lines (one at lead) may be hung up at the 
end of an Houfe (as at K. Fig. 2.) or on th'e bough of a 
Tree (if the Wind would not (hake it) or any where 
you fee fit. And the Sights muft be (tuck up, fo as to 
bring the Pole-Star to interfeft^ and all be performed, as * 
bath been before directed. 
This, although in a manner the f«me with the Inftru- 
ment before, yet is more convenient in fome refpefts* 
Cheifly becaufe the Plumb lines may be made longer,and 
the Sights fet farther afunder, than in the Inftrnment 
before can conveniently be done 3 which is fome, altho 
no great advantage for^feeing the Tranfits. Alfo, thefe 
Sights may be made fo light, as to be eafily carried about 5 
or they may be eafily made, or imitated ia any place 
where-ever you come. 
To knovp x&hen the Polar Star cometh on the Meridian. 
It is neceilary I fhould fhew how this is done, for thie 
'fake of fuch.asknow it not, to whom the foregoing in- 
frruments may be ufeful. The way is this, Subftraftthe 
iiight Afcention of the Sun from the JR. Afc. of the Pj?/e- 
Star^ the Rmainder giv^xh the Degrees, Minutes and 
Seconds 
