A liner is a
graver that cuts several lines at one pass. They were
used for "shading" which adds the impression of depth to
a design. Some of the imported trade locks show the use
of liners in the engraving but use by American gunsmith
generally dates very late in the 18th century.
The grand rifle by John Sheets illustrated in Volume V
of JHAT has liner decoration around some of the screw
heads.Bottom of liner with seven teeth:
End view of cutting surface (coated with black marker to
hide the glare):
A few quick cuts:
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