The support is a piece of wood, 1-1/2 inches square and 12 to 15 inches
long, screwed on to a large foot, which should be fairly heavy, as any
tilting or slipping will, of course, spoil the silhouette. The universal
joint for the rod is made by soldering a small U-shaped piece of metal to
the end of a short metal bar. The ends of the U are drilled for a pin
passing through the rod; and a hole is sunk into the top of the support to
take the bar. The fit should be close, to prevent the pivot rocking about,
and the hole in the support deep enough to bring the bottom of the stirrup
down against the wood.
If a series of holes half an inch apart is drilled, through the rod, the
nearest 9 inches from the pencil end, the size of the silhouette
proportionately to the original can be varied by moving the pin from one
hole to another.
[Illustration: FIG. 188.--Silhouettograph in use.]
[Illustration: FIG. 188a.--Group of silhouettes drawn with the machine
described.]
The pencil holder is 4 inches of tubing, in which the pencil can slide
easily without shaking. If necessary, the size of the pencil should be
reduced by rubbing with glass paper.
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