The Ottawa free trader. [volume] (Ottawa, Ill.) 1843-1916, 1867-06-22
Information.
Cement and Unitin. Bodies.

In the preparation of cements and all substan-
intended to produce close adhesion, ssmi-fiuid
or pasty state, freedom from dirt and grease
without slovenliness. is most essential and nee.
cssary condition.
A temporary cement, to fix optical glasses,
stones, jewelry, &c. on stocks or handles for the
purpose of painting, repairing, or ornamenting,
is made by melting together at a rood heat, tive
ounces of resin, one drachm of wax, and two
ounces of whiting; with this applied to the
article when heated, secure fixation may be OBJ
tanned, unfxed at pleasure by the same means,
VIZ, heat.
RICE CEMENT, which is made by mixing rice
-four intimately with cold water, and then gently
boiling it, forms beautifully white preparation,
and dries nearly transparent: it rs capable OF
bearing very high polish and is very durable;
it is in every respect far before the common paste
made with wheat -four or starch it may betorm-
cd, also, into plastic clay.
For UNITING STONE, DERBYsumE SPAR,
ETC., ETC, melt together fou- ounces of resin and
half an ounce OF wax and about an ounce OF fine
ly-sifted plaster of Paris. The articles to be
Joined should be well cleaned, and then made hot
enough to melt the cement and the pieces then
pressed together very closely. to leave as lit
tie as possible of the composition between the
Joints This is a general rule with all cements,
as the thinner the stratum of cement interposed
the firmer it will hold.
CEMENT FOR CHEMICAL GLAssEs-Mix equal
parts of wheat flour, hnely-powdered Venice
glass, pulverzed chalk, and small quantity of
brick-dust, finely ground these ingredients with
little scraped lint, are to DC mixed and ground
up with the white of eggs it must then be
spread upon pieces of fine linen cloth, and APP
piled to the crack of the glasses, and allowed to
get thoroughly dry before the glasses IRE put to
the fire.
PUZZUOLANA CEMENT-A kind of earth
thrown out of volcanoes, of rough dusty, gran
ular texture; its most important property con-
sists in making cement when mixed with one
third of its weight of lime and water, which
hardens very suddenly, and is more durable I'M
der water than any other. Manganese is found
to be valuable ingredient in water cements.
-Four parts OF grey clay are to be mixed with six
parts OF the black oxide of manganese and about
ninety of good limestone, reduced to fine pow
der the whole to be calcined to expel the car
bonic acid when well calcined and cooled, to be
worked into the consstence of stiff paste, with
sixty parts of washed sand
The DIAMOND CEMENT for glass or china is
nothing more than isinglass boiled in water to
the consistency of cream, with q small portion
of rectified spirit added. To be warmed when
used.
LEAKY SKYLIGHrs may be stopped and cured
with Dutch PUSHES, bedded in and covered with
good white lead. On wet making its appearance
it quickly attacks the rush, which swells up SO
tight and firm that all progress of wet and drop
pings is efectually stayed
Lemery, the chemist used the following lutte
for stopping retorts, etc.: Fine flour and fine
lime, OF each one ounce, potters earth half an
ounce; make a moist paste of these with white of
egg, well beaten up with little water, and this
will be found to stop exceeding close
Philosopher Boyle recommends, or experience,
the following for the same purpose: Some good
fine qui2kiime and scrapings of cheese, pounded
In morter, with as much water as will bring
the mixture to soft paste then spread on a piece
of linen rag, and apply it as occasion requires