oure-lines, wee are to confider, firft the length of the t 3 axis- 15& <J$e fofaiftiw of the Tropiques axis of the ftyle iv. inches and parts of inches 5 fecondly theheight of the ftyle aboue the planejthjrdly the angles at thepole betweene the proper meridian and the houre-circles.Thefe… … Let the triangle A B C be made equal to the flyle belongingto your plane, A C the fubftylar^ C the axis of the ftyle, ABthe length of the ftyle perpendicular to the plane. Then ha-uing drawn the line BDperpedicular to the axis on the ceterB3& any femidiameter B D defcribe an occult ark of a…
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