4 Ti Deſeriptin. tl Hui. linesAn. Po. Ar. Pla. ſC IC there remains 3 gr. 55 m. for3 Cr. I. Cr. NI. In- Par. In. Par. er at 15 1.1755 the Meridian of the Plane and% zj 3 5225 85] de Fer ek 6. To diele An-63! fer every Hour, as in the ſecondColumn of chis Table.

— Tzhen having the height of5 5 ＋7= che Pole above the Plane, and8 ö cheſe Angles at the Pole, the10 g 8 Sabltel ö Arks of the Plane between che

erid. 985 Subſtylar and the Hour · circleswill be found as in the thirdColumn. 5

Theſe Arks being found, willſerve for the drawing of theHour- lines on either Face ofthis or the like Plane.

1. By che help of a Thredand Plummet I draw Z C a

8 Vertical Line, ſerving bothfor the Meridian of the place, and che Hour of 12.

2. In this Meridian Line I make choice of à Center in the upper partof the Line, if it had been the Southern Face of the Plane; but here inthe lower part ef the Line, becauſe we ſuppoſed it to be the Nortl-welt Face of the Plane, and the Style muſt point upward: and upon thisCenter J deſeribe an occult Circle, repreſenting che Declining Verticalbelonging to this Plane. a g

3. I find a Chord of 38 gr. 23 m. the diſtance of the Subſtylar fromche Meridian of the Place, and inſcribe it into this Circle, from Z in theMeridian, unto T toward the left hand, according as the proper MeridianP I falls in the Fundamental Diagram; and here I draw the Line CTſerving for the Subſtylar..

4. The Subſtylar being drawn, I may inſcribe the Chords of the Arksof the Plane from the Subſtylar, and draw che Hour- lines, and ſet up theStyle, as in the former Plane. 5 5

Or the Arks of the Plane from the Subſty lar being found as before, wemay drau/ the Hour · line, upen the Plane otherwiſe than by Chords: Forhaving drawn the Hour-lines as in the laſt Figure, upon Paper 7

ö g board,

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n A 8201

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