Of Direction, Place, and me 111 will be seen under the next verse, is properly represented on the dial, not hy its east fnd west axis, }ut by the line of the equinockial shadow 7. Draw likewise an east and est line through the extre- nity of the quinctial shadow (ishw?tbl: the interval be tween any given shadow and iihe line of tle equinoctial shadow is ftnominated the measure of arrplitute (agrif) ( The equinoetin behavior is doing : In }bquent passug (0, 12 TB}; i j, A { ray hand sion to notice index ii. 61-68). {he shadow east at hid-day when the Sun i« at either equinox-that is to say when he i; in the plane &f the equator. Now us the quator is circle of diurnul re¥QJ•tion he line 0; into section of is plane with +hat of the horizor1 will be an east and x-text line; and since it is also १ rt citle hat line wil pass through the entry: the place of the obt 'y it, thereforewe rew through the extremity of the equinoctial Slov ३ ]ire parallel to the exan of axis of the lia! it will repre. sent the inte$ction with the ja of 1 qipectial plant passing through {he top if the norm Ind in it w timate the links kr: w through that joint from any point in the plal If the •quato] and here: it will also coincide with the path of (ke extremity of the Bhadow on 31 day of he equinox. Thus, let the following figuro (lig. 0) reprv" ५]. the plane of the dial, NS a +1} ]z being it { १es and a the ५५: of the non nd le, th। xhday cast at noon then bhe sun is upon the equator be. Fig. 9. giv• dubiturebe | h" is h equinoe lharkow and to •raxy) (hrough a and tall to F . is the oth of whe equinoctial shals, being thcline in which a rany of the sm frorm any point in the plane of the equato¥, passing through the top of the <nomon, wil meet the fne of the dis] In the figure १s given, the circe is supposed to be described about the page of the gnomox with a radius of forty digits, and the graduation of the custom and western side of the circumscribing squareused in measuring the bake (bujg) of the shadowis indicated
