Emerson, William, 1701-1782 · London : Printed for J. Nourse · leaf 248
uar-ter pajl ^ oclock before noon. I. By the Orthographic Proje^ion.12. Here we will projecSl the convex fide of the eaft-crn hemifphere. With the chord of 60 degreesdefcribe the primitive circle or meridiiii of the placeHZON. Thro the center C draw the horizon HO ;let the latitude 544 from O to P… … ^■F-^^
Mechanical engineering
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