If the apparatus works stiffly, ease the holes a trifle and lead-pencil
the wood at all points where two surfaces rub. It is absolutely impossible
to make a good reproduction with a stiff, jerky pantograph.
To decide the positions of original and the paper for the copy, get the
pointer centred on the original and adjust the paper till its centre is
under the pencil.
XXXVII. A SILHOUETTE DRAWING MACHINE.
With this very simple apparatus you will be able to give good entertainment
to such of your friends as may wish to have black paper records of their
faces in profile.
The machine is merely a long rod, with a sliding pencil attached to one end
and a metal pointer stuck into the other, supported near the pencil end on
a pivot which permits free movement in all directions.
For heads and busts only, the rod and pointer combined need not be more
than 4 feet 6 inches long. The rod is a 1/2-inch blind rod, the pointer a
stout knitting-needle driven axially into one end of the rod. This pointer,
being of small diameter, follows the minor curves and angles of the
features much more closely than would be possible with the rod.
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