St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 400
drawn from its vertex, g, to themiddle of the side of its base. Inmeasuring a real pyramid, a g willusually be the line most easily found ;but in many architectural problems b gis given, or is most easily ascertainable.Observe therefore this general con-struction. Let a B D E, Fig. 57., be the… … H 72 THE ELEMENTS OF PERSPECTIVE, Now if the vertical altitude of the pyramid (c d in Fig. 25.)be given, make v g equal to this vertical altitude. Join G B and g h. Then g b and g h are the true magnitudes of g b and g h inFig. 56. If G b is given, and not the vertical altitude, with centre b,and…
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