0.5

1 cm

[ 93 ]

cylinder, and which falls on the cylinder, 13 formed,

by sele&ing as many points as are thought necessary

between A B and B C. As at B, rule B H ; where it

touches the top of the cylinder, let fall a perpendicular ;

where that is intersered by B R is the (hadow of B,

as at L. The same for any other point, between A

and B,

The shadow of the board on the ground is found by pro-

curing its seat, as of A B C, at a b c; which are ruled to

H. The shadow of the wire e on the cylinder is found by

ruling its seat d to H, striking the bottom of the cylinder

in D ; then eredfing a perpendicular, which is cut by

e R for the place of the shadow of e: the same method

procures G and F.

This figure exemplifies the method of treating co-

lumns, &c. in architedlure, the shadows of square

mouldings, &c. when they fall on columns, &c.

PLATE XIV.

No. I. In this example we have a wall (G), and, at

right angles with it, another wall, with a door-way in it»

H L is the horizontal line; the sun is supposed in the

plane of the pidture ; the inclination of its rays, to be

RH.

First, from the bottom of the projedting wall, rule a

horizontal line to the bottom of the wall G; where eredt

a perpendicular, which, cut by a lineTrom a parallel to

R H, gives u for the shadow of a, which unite to. Or,

rule from R, t u, which gives the shadow of the top t a; c

and d are exadtly similar.

28 O

The

cylinder, and which falls on the cylinder, 13 formed,

by sele&ing as many points as are thought necessary

between A B and B C. As at B, rule B H ; where it

touches the top of the cylinder, let fall a perpendicular ;

where that is intersered by B R is the (hadow of B,

as at L. The same for any other point, between A

and B,

The shadow of the board on the ground is found by pro-

curing its seat, as of A B C, at a b c; which are ruled to

H. The shadow of the wire e on the cylinder is found by

ruling its seat d to H, striking the bottom of the cylinder

in D ; then eredfing a perpendicular, which is cut by

e R for the place of the shadow of e: the same method

procures G and F.

This figure exemplifies the method of treating co-

lumns, &c. in architedlure, the shadows of square

mouldings, &c. when they fall on columns, &c.

PLATE XIV.

No. I. In this example we have a wall (G), and, at

right angles with it, another wall, with a door-way in it»

H L is the horizontal line; the sun is supposed in the

plane of the pidture ; the inclination of its rays, to be

RH.

First, from the bottom of the projedting wall, rule a

horizontal line to the bottom of the wall G; where eredt

a perpendicular, which, cut by a lineTrom a parallel to

R H, gives u for the shadow of a, which unite to. Or,

rule from R, t u, which gives the shadow of the top t a; c

and d are exadtly similar.

28 O

The