8 Tl Deſtription of tl Hu- linesreprelent cle Asis of the World, and be truly placed for caſting of theShadow upon the Hour- lines in chis Declining Plane. 2 a

4 ſecond Eææampl..

Suppoſe another upright Plane in the ſame Latitude to decline fromche Vertical 6 gr. 44 un. with one Face open to the South- eaſt, the otherto che Nortk-welt. Theſe 65 gr. 40 m. would be numbred from E untoand from W unto H, and the Plane repreſented by Q H: For ſo

tlie one Pole will fall at B in the South- eaſt, and the other at D in theNorth- weſt, according to the ſuppoſition. The proper Meridian of thisPlane may be ſupplied by the Circle B P, croſſing the Plane in the PointT, between che Fours of 7 and 8, andd there is che place of the Subſty-lar. The South- eaſt Face will contain all the Hours from Sun- riſing unto2 after Noon; and che North · weſt Face, all the Hours from after Noonunto Sun- ſetting. Then working as before, f1. The Angle Z P T, the Inclination of the two Meridians, will befound to be about 7e degrees 30 minutes.2. The Ark PT, che meaſure of tlie

5 S 45 75 Angle PC T, the height of the Pole aboveOf. Nerd 58. 30 the Plane, and ſo che height of the Styleif. Merid. 70 3 above the Subſtylar, will be 14 gr. 51.

5 ö 5 the meaſure of theDit. Sublt. 575 3 5 2 W Z. CT, ſhewing the diſtance of the1 1 14. Sr. I. Subſtylar from the Meridian, will be 35 gr.

1 5— 6m. 5 s

1079 728 5 4. The Arks of the Plane between thie964 30 5 10% Subltylar and che Hour-lines, depending8049 30 4% on thie difference of Meridians, which is734 30, 9 bere 70 gr. 30. or 4 bo. 42 m. ort of che69 300 5 1 Meridian, I firſt draw a Table wich chree

5% 30% ua 9 Columns, one for the Morning and EveningINerid. Subſtyl.“ Tours, another for the Angles at the Pole,

4010 39 2 43 and the third for the Arks of the Plane,325 30 6 58 anddl there write 70 gr. 30 2. by the EHlour2440 30½2 27 of 12, and place the Meridian and Subſty-388 28 lar between the Hours ef 7 and 8, accord-

12%% 3035 5% ing as the Poles of che Plane do fall in the

11485 322 Diagram. i