In the Giraud Palace and the great Palazzo della Cancelleria, pilasters appear in the external composition, and all the details of doors and windows betray the results of classic study, as well as the refined taste of their designer.

Façade of the Giraud Palace, Rome

In the Giraud Palace and the great Palazzo della Cancelleria, pilasters appear in the external composition,…

"Section of Fortified Wall. (Interior on the left; exterior on the right.) a, a, is the abatis; b, b, the counterscarp; c, c, the palisade; d, d, the scarp; f, f, the fraise; f, e, g, g, the parapet; h, the banquette; and i, g, the breast-height." -Whitney, 1911

Section of Fortified Wall

"Section of Fortified Wall. (Interior on the left; exterior on the right.) a, a, is the abatis; b, b,…

"Exterior view of Kaid Bey Mosque, Cairo." — Encyclopedia Britanica, 1893

Kaid Bey Mosque

"Exterior view of Kaid Bey Mosque, Cairo." — Encyclopedia Britanica, 1893

A view of the left semilunar from the external surface.

Left Semilunar

A view of the left semilunar from the external surface.

Illustration showing that when two parallel lines are cut by a transversal, the exterior-interior angles are equal.

Parallel Lines Cut By A Transversal

Illustration showing that when two parallel lines are cut by a transversal, the exterior-interior angles…

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior angles."

Exterior Angle Proof

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior…

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two adjacent sides being prolonged through the same vertex, the sum of the exterior angles thus formed is four right angles."

Sum of Exterior Angles of a Polygon Proof

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two…

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as the polygon has sides, less four right angles."

Sum of Interior Angles of a Polygon Proof

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as…

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side into segments which are proportional to the adjacent sides.

Exterior Angle Bisector of Triangle Dividing Opposite Side Into Proportionate Segments

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side…

Clapboard or bevel siding is the horizontal and overlapping style of laying board on the exterior of a house. "C, clapboard siding, g being rabbeted at the lower margins and g' simply overlapped." -Whitney, 1911

Clapboard Siding

Clapboard or bevel siding is the horizontal and overlapping style of laying board on the exterior of…

Illustration to show that the bisector of an exterior angle of an isosceles triangle, formed by producing one of the legs through the vertex, is parallel o the base.

Bisector of an Exterior Angle of an Isosceles Triangle

Illustration to show that the bisector of an exterior angle of an isosceles triangle, formed by producing…