The Use of the Globes.yR I], nso fad the Sun’s Place in

s\

' E *ft7c.

r, Find

lH> s ,

>lf of jd°w the Horizon, and to six above it, in each(1 Shaj" e ^ a y ; and consequently, that on that DaySu,° W w dl occupy but 12 ot the. Hour-Lines on

syi

at 6.

fr , ).'ft nice °F the Plane, beginning and ending .

Nal D whcn the Sun is in the Tropic of Cancer, its,A> ti ^th for that Day being the Tropic itself T C. h] a S nia nifest the Sun in the Forenoon ascends aboveSfi* P affin g between the Hour-Circles of 3 andrUe 0rnine b and descends below it in the After-ItVrTs 6 *' the Hours of 8 and 9 : Therefore on theijSujY tropic the Shadow will pass over 16 of thoseT nt tr_|> S ‘ And vice versa, when the Sun is in the3 b~ ^topic at O, its Path being then O GI H, itVet,° Ve the Plane between 8 and 9, and leaves itr l 8. a nd 4. _

v 6 Cj t [ 0,il what has been said ’tis evident, that if PI. LXV*a^l b, es be supposed removed, and only the hori- Fig. 5.

\ Qy,,. ar\e remain, with the Half of the Axis N P

V"-

^ the same Position as before, then should '

fan.‘“tituted an Horizontal Dial, every way

w _

j»ith those in common Use, as represented in> to J S Ur e, with onlv the' Addition of a SubstyleV' fse" en ^ er Style N P very firm.

^ N p . Ce a Ppears the Reason why the Gnomon or^hole Dials is always directed to the NorthAc '•f contains such an Angle P N O with

I;. e : r _ 12 N B as is equal to the Latitude of the

"l.

^ 0ll a %, the Reason why the Number of Hour-'to 1 " 6 t these Dials exceeds not 16, and are all drawnto t ? 12 and 6 again on the Northern Part, the^ direct, Southern; and why the Hour-Line of 6y £< i/?and V/esi, as that of 12 does NorthIf '

p a Plane be fixed with the same Sphere in a Fig. 6,L'ti^n^’nion, or perpendicular to the Horizon, and '

"g ^dth the Plane of the Prune Vertical, i- e.bomh and North ; then will the Axis P S.

5 ' still