The Mt. Sterling advocate. (Mt. Sterling, Ky.) 1890-current, 1895-06-18
GLASS PAPER.
That Would be a More Accurate
Designation Nowadays Than
sandpaper-


Sandpaper as now made is false to
its name, for il has no sand about it,
the place of that material being now
taken unusually by powdered glass,
which does its work with vastly
greater effect, says the Philadelphia
Enquirer.
One of the most important opera
tons in the fabrication of sandpaper
is the pulverization of the glass into
powder of the different grades Of fine
ness. Commonly an iron mortar is
used for this purpose, a heavy iron
pestle being the crushing instrument.
Stamping machinery is better. 1t
consists of a stout box, whose iron
side walls serve as base for the
stamping machinery. In the box
which can be closed by wooden door
to prevent waste of material and also
injury to the workman, are two iron
cylinders in which play the stamps.
These crush the glass, turning on their
owa axles as they work.
For grading the powder several
shifting cylinders are necessary, COW
cred with gauze of different mesh.
Beginning with the coarsest the work
man proceeds gradually to the finest,
RESTING each time that which passes
through the network.
The paper to be used in the manu-
facture must be good, strong and
rather long fbred it must also be free
from knots and irregularities, and if
there be any such they must be planed
off. If they should be overlooked,
they would interfere with the proper
use of the sandpaper; the knots would
protrude through the glue, and little
ridges and channels would result,
making it impossible TO smooth off
surface evenly with the paper.
The paper is cut into two large
sheets, spread on work tables, fasten-
ed down, and then painted by means
of large brush, with thin, even coat
of hot glue. If the glue is too thin
and the paper OF bad quality, the glue
soaks into the paper, so that which re-
mains is not of sufficient consistency
to hold the glass. Thus results a
sandpaper from which the glass easily
+ BIS of, or which in places has nc
glass at all, or not enough. This is no.
tably the case with the coarser varie'
ties, in which the layer Of glue mus
be put on with exceeding care thai
the relatively large fragments OF glass
which eau in no manner be soaked
with the binding material, may be
held fast in it. On the other hand, il
the layer of glue is too thick or the
consistence too vicious, the outer par
hardens too quickly, so that the glass
powder cannot EN- bed itself it it.
When the glue has been spread on
the paper the powdered glass must be
sifted on through an appropriate sieve
This operation also requires consider.
able skill, though not so much as the
spreading of the glue. For the glass
must not be sifted merely in such q
manner as to use given quantity TO Z
sheet, but SO that each sheet may bt
covered evenly. Even then all the
powder will not stick, and some of thu
particles lie upon others withou
touching the glue; these can be shak
en- off bya slight movement OF thu
paper. When the superfuous glass
powder has been removed wooden
roller is passed lightly over the pape
to press the particles of glass as tirml.
as possible into the glue and to form
perfectly even service.