_Magnified 5 to 10 times._]
Diagrams A, B, C, and D, represent the appearance of various IMITATIONS of
Geometric Lathe-work when magnified with a powerful glass. There is
generally a studied effort to represent _white_ intersecting curved lines
or Geometric Circles on a _black_ ground; in fact trying to imitate
TRANSFERRING; but there will always be found, as in the above diagrams,
nothing but confused black dots and semi-circular scratches, arranged so
as to give it the same “_general appearance_” as the genuine, when held a
little distance off. Sometimes there is no effort made to imitate the
_white lines_, and there will be seen nothing but confused black dots and
irregular black curved lines, mixed up together. Diagram E represents a
magnified oblong-die, of alternating waved ruling, or eccentric parallels
transferred. See the two dies containing the figure “20” in the steel
plate illustration. This work is done by the Ruling Engine, and not by the
Geometric Lathe; but as the work is very similar, and imitations of it
fail in exactly the same manner, it is classed under the same rule.
Diagram F is a representation of a magnified counterfeit or imitation of
this work by hand; confused black dots on a _white_ ground, instead of
true interwoven white lines of the genuine on a _black_ ground.