Smith, Thomas [Editor]: The Art Of Drawing In Its Various Branches: Exemplified In A Course Of Twenty-Eight progressive Lessons, Calculated To Afford Those Who Are Unacquainted With The Art, The Means Of Acquiring A Competent Knowledge Without The Aid Of A Master ; Being The Only Work Of The Kind In Which The Principles Of Effect Are Explained In A Clear, Methodical, And At The Same Time Familiar Style. Illustrated With Coloured Designs And Numerous Wood Engravings (London, 1827)

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PERSPECTIVE.

A Vanishing Point is any point in the perspective
plane in which two or more parallel lines of aii object
would meet or vanish : and vanishing lines are the said

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lines of an object which meet in a point.

The Point of Distance is the distance of the eye from
the picture, which ought always be equal to or greater
than its length. This point is sometimes placed above
the picture, but the best method is to continue the hori-
zontal line beyond the edge of the picture, and then
mark off from the point of sight on either side the dis-
tance of the picture, which will give the point of distance.

Example. Suppose A BCD to represent the plane
of the picture, EF the horizontal line, and G the centre
of the picture: in order to find the point of distance,
continue the horizontal line forward from F to any suffi-
cient distance, say f\ then from the point of sight G,

A________ A

r,---------------------—.! >

with a pair of compasses mark off the point II, which
will be the point of distance, the line from G to H being
equal to the length of the picture.

Note. When the paper on which the student is
drawing is too small to admit of the continuation of the
horizontal line, it may be fastened to a board or table,
on which the line can be drawn as if it were on paper,

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