till the piece of fluor be reduced to its in-
tended form.
The laths worked by machinery poflefs at
great advantage* the tool being applied with
more delicacy* from the body not being in
motion, as in turning the foot laths* Another
great advantage is, that any motion is
procured by a. touch; as in fome cafes si
very quick motion is required, and in others
very flow*
The piece being thus formed, and rendered
fmooth by the fteel inftruments, in
order to render it , fit to receive a polifh, a
eoarfe Hone is applied with water, fo long as
the fmoothnefs is improved by thefe means.
Then finer grit flone, pumice, &c. till the
piece be fufficiently fmooth to receive eoarfe
emery, and afterwards fine emery.
I f with the latter it appear of a good
fhining glofs, then the fineft putty is cm-*
ployed for a confiderable length of time,
till
till the polifh be as bright as poflible, which
is known by throwing water on it. I f the
part thus watered appear higher polifhed
than the reft, the polifhing is continued
till water will not heighten the appearance.
The advantage of the lath, worked by
water, is particularly confpicuous in forming
delicate hollow vafes, See. for by the ufe of
the foot lath, the fluor was frequently
broken, and its laminated texture at all times
difturbed; but the ufe of the water lath*,
by its fteadinefs, prevents thefe inconveniences.
" The firfl mill that was built for Sir
Thomas Lombe, at Derby, is now converted
into a manufactory for this purpofe,
as mentioned in the firfl: feCtion. This
beautiful production of nature is here formed
into elegant urns, vafes, columns, &c.
giving employment to a number of families,
c and