Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 248
then measure the distance to the buildingand apply the formula if = x tan 0. It should always be understood that expensive appa-ratus is not necessary for such illustrative work. Thetelescope used on the transit is only three hundred years LEADING PROPOSITIONS OF BOOK III 237 old, and the world got… … A Quadrant of the Seventeenth Century In order that this may be the more fully appreciated, afew illustrations are here given, showing the old instru-ments and methods used in practical surveying beforethe eighteenth century. The illustration on page 236 shows a simple form ofthe quadrant, an…
Geometry
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