Image from page 842 of "Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of systems.." (1798)
Title: Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of systems..
Authors: Encyclopaedia Britannica, inc
Subjects: Encyclopedias and dictionaries
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive
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ane, draw the parallel right lines a c andd b, upon that plane, as far from each other as is equalto the intended thickncfs of the gnomon or flile ofthe dial, and the fpace included between them will.bethe meridian or twelve oclock line on the dial. Crofsthis meridian at right angles with the fix oclock lineg /, and fettingone foot of your compaiFes in the in-tcrfection *, as a centre, defcribe the quadrant g twith any convenient radius or opening of the compaf-fes: then, letting one foot in the interleflion h, as acentre, with the lame radius defcribe the quadrant//,and divide each quadrant into 90 equal parts or de-grees, as in the figuix. Becaufe thehoar-iincs are lefsdiflant from c^rh otherabout noon, than in any other part of the dial, it iibcft to have the centres of thefe quadrants at a li[tle di-ftance from the centre of the dial plane, on the lidc op-pnlltc to XII, in order to enlarge the hour-difiancesthereabouts, under the fame angles on the plane. Thus, the i»!.ilc CI.Mil
Text Appearing After Image:
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