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A text-book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained .. (1850)

Minifie, William, 1805-1880. [from old catalog] · Baltimore, W. Minifie & co. · leaf 113

An illustration from A text-book of geometrical drawing, for the use of mechanics and schools, in which the definitions and rules of geometry are familiarly explained .., 1850, leaf 113
/y^.j. … PLATE XXIV. 55 4th. The crown of an arch is the highest point, as D. 5th. VoussoiRS is the name given to the stones forming the arch, 6th. The keystone is the centre or uppermost voussoir D, socalled; because it is the last stone set, and wedges or keys thewhole together. Keystones are frequently…

Mechanical drawing · Geometry, Descriptive · Perspective

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