—

152 07 kum and placing the Stile.

the Thred at the remoteſt Diſtance, and keep it there. i

8. From every point on the ſide A C of your Quadrant, take che leaſtDiſtances to che Thred ſo laid; ſetting them down from A to 7 and 5,from A to 8 and 4, from A to 9: A 10 Was put on before. Then cheleaſt Diſtance from r to the Thred being twice turned from A towards B,will give the Length from A to 17. a 3

9. For the finiſhing then of the hours you have no more to do, butdraw right lines through each couple of correſpondent points, namely,from 4 to 4, 5 to 5; from Cto A, or 6 to 63 from 7 to 7, 8 to 8, 9to 9, Jo to 10, and from 1f to 11. 5

41 coscerning the firing and elacing of the Stile.

10. B the precedent ſeventh Propoſition you may find cke Planes

a Difference of Longitude, which(for this Plane that de-clines 82 gr.) will be(here at Lenden) 83 gr. 43 win. and that fromthe South, becauſe the Plane declines from the Soutb. The Comple-ment of which Longitude(8 3 gr. 43 min.) is 6 gr. 17 min. Takethen firſt, the Length from C to 7 the next hour point upon C E, andcarrying ckat extent to your Quadrant, ſet one Foot of it upon 15 inthe Scale AP;: and lay the Thred ſo, chat che other Foot turned a-bout may jalt touch or paſs over it, and keep the Thred there. Then

Lin the Scale A P) count the fore- mentioned Complement, 6 gr.

17 min. and taking the leaſt Diſtance ſrom that Point to the Thred,ſet it from 6 a Clock at C, towards E if the Plane decline from South,(or towards D if che Plane decline from North) as you ſee it donehere, at G. Secondly, do che ſame work again upon the line AB; That is, take from A to 7 the neareſt Hour point, and ſet oneFoot of that extent upon 15 in che Scale A P, and with the otherFoot turned about, lay the Thred as before. Then in the ſameScale A P, count the ſame Number 6 gr. 17 min. and taking theleaſt Diſtance from thence to the Thred, ſet that Length from Ato K, anſwering to C G. And laſt of all, draw the Right LineG K. This ſhall be the Line of Deflection oyer which the Stile muſtſtand.

11. Furthermore, Through the Points G and K(or any othertwo points of the ſame Line) draw the two Lines G O, K P, both

perpendicular to the Deflection Line GR. Then conſidering, that

eyery Hour comprehends 15 Degrees of Longicude(that is, 85