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DOCUMENT 202.
DESCRIPTION OF THE MODE IN WHICH MARBLE
SLABS ARE INLAID FOR TABLES AND OTHER
ORNAMENTS.*
The marble table or slab which is to be used for the work
ought to be of a dark colour and well polished. By means
of a fine sharp chisel the ground which is to be inlaid is cut
or dug out to the depth of half a finger or less, and to the
same width or size as the pattern, which may consist of a
playing-card, jettons [ counters formerly in use in playing cards),
false faces, letters, papers of music, combs, shells, roses, &c.
Two chisels with well hardened steel-ends are to be used,
one of which should have a sharp point on one side. This
point is used to trace correctly and accurately the outline
of the object which is to be dug out in the marble. The
other chisel is also sharp, but has a rounded edge for the
purpose of digging out the marked surface. The handle of
these chisels is to be of wood, and the mallet which is brought
down upon the handles of the chisels in the usual fashion is
also of wood. The work of digging out the objects, if there
are from six to eight designs to be executed, occupies from
two to three days, allowing four hours of work each day.
Fine and brittle spar ( Spat) is now taken and exposed to
the fire on an iron -plate of optional thickness for the purpose
of calcination, and this purpose is accomplished when it can
be rubbed apart between the fingers. This lime is now ground
in a mortar and sifted through a fine hair -sieve. That portion
* This Paper is contained in the Transactions of the Royal Academy
of Sciences for the months of April, May, and June, 1763, Vol. XXIV ,
pp. 107–113.
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