The Abilene reflector. [volume] (Abilene, Kan.) 1883-1888, 1885-12-31
ABOUT DEMENT'S.
Composition of Cohering Mediums for Va
rious Purposes.

Composition of Cohering Mediums for Va
rious Purposes.
The value of a cement is, first, that
it should become strongly cohering
medium between the substances joined;
and, second, it should withstand the
action of heat, or any solvent action of
water or acids. Cement often fails in
regard to the last consideration. For
waterproof uses, several mixtures are
recommended, and the following may
be mentioned: One is to mix white
lead, red lead and boiled oil, together
with good size, to the consistency of
putty. Another is powdered resin one
ounce. dissolved in ten ounces of
strong ammonia; gelatine, i've parts;
solution of acid chromate of line, one
part. Exposing the article to sunlight
Is useful for some purposes. A water
proof paste cement is said to be made
by adding to hot starch paste half its
weight of turpentine end small piece
of alum. As cement lining for els
terms, powdered brick two ounces,
quicklime two, wood ashes two, made
into paste with boiled oil, is recon-
mended. The following are cements
for steam and water joints: Ground
litharge, ten pounds; plaster of Paris,
four pounds; yellow ochre, one-half
pound; red lead, two pounds; hemp
cut into one-half inch lengths, one
half ounce, mixed with boiled linseed
oil to the consistency of putty. White
lead, ten parts; black oxide of manga
nese, three; litharge, one. Mixed with
boiled linseed oil. A cement for Joints
to resist great heat is made thus: As
bestos powder, made into a thick paste
with liquid silicate of soda. For coat
ing acid troughs, mixture
of one part pitch, one part
resin, and one part plaster of
Paris, is melted and is said to be good
cement coating. Correspondents fire.
quently ask for good cement for fixing
iron bars into stone in lieu of lead, and
nothing better is known than a COM
pound of equal parts of sulphur and
pitch. A good cement for stoves and
ranges is made of fire-clay with solu-
ton of silicate of soda. A glue to re-
sist damp can be prepared with boiled
linseed oil and ordinary glue, or by
melting one pound of glue in two quarts
of SKINNED milk; shellac, four ounces;
borax, one ounce; boiled in little
water and concentrated by heat to
paste. A cement to resist white heat
may be usefully mentioned here: Pull
verified clay, four parts; plumbago,
two; iron filings, free from oxide, two;
peroxide of manganese, one; borax,
one-half, sea salt One-half. Mix with
water to thick paste, use Immediately,
and heat gradually to a nearly white
heat. Many of the cements used
which are exposed to great heat, fail
from the expansion of one or more in
gradients in them, and an unusual
stress is produced, or the two SUBJ
stances united have unequal rates of
expansibility or contractibility. The
chemical or galvanic action is import
ant. The whole subject of cements
has not received the attention it de-
serves from practical men. Only Port
land cement has received anything like
scientific notice; and few experiments
upon waterproof, heat-resisting and
other cements would show which
cements are the best to use under GER
tain circumstances.-FdTn1, Field and
StOckn1dn.