Glue for Tablets.‑
I.—Glue . 31 ounces
Glycerine 8 ounces Water, a
sufficient quantity.
Pour upon the glue more than enough water to cover it and let stand for several hours, then decant the greater portion of the water; apply heat until the glue is dissolved, and add the glycerine. If the mixture is too thick, add more water.
.................. 6 ounces
Alum ................... . 30 grains
Acetic acid............ ... 1 ounce
Alcohol ....................... 11 ounces
Water............... 61 ounces
Mix all but the alcohol, digest on a water bath till
the glue is dissolved, allow to cool and add the alcohol.
III.—Glue.... .............. 5 ounces
Water.. .. 1 ounce
Calcium chloride... 1
ounce
Dissolve the calcium chloride in the water, add the
glue, macerate until it is thoroughly softened, and then apply
heat until completely dissolved.
I V. —Glue, 1 pound; glycerine, 4
ounces; glucose syrup, 2 tablespoonfuls; tannin, TIIT ounce. Use warm, and
give an hour to dry and set on the pads. This can be colored with any
aniline dye.
Marine Glue.—Marine glue is a product consisting
of shellac and caoutchouc, which is mixed differently according
to the use for which it is required. The quantity of
benzol used as solvent governs the hardness or softness of the glue.
I.—One part Para caoutchouc is dissolved in 12 parts benzol; 20 parts
powdered shellac are added to the solution,
and the mixture is carefully heated.
II.—Stronger glue
is obtained by dissolving 10 parts good crude caoutchouc in 120 parts
benzine or naphtha which solution is poured slowly and in a
fine stream into 20 parts asphaltum melted in a kettle,
stirring constantly and heating. Pour the finished glue, after the
solvent has almost evaporated and the mass has become
quite uniform, into flat molds, in which it solidifies into
very hard tablets of dark brown or black color. For use, these
glue tablets are first soaked in boiling water and then heated over
a free flame until the marine glue has become thinly
liquid. The pieces to be glued are also warmed and a very
durable union
is obtained.
III.—Cut caoutchouc into
small pieces and dissolve in coal naphtha by heat and agitation. Add
to this solution powdered shellac, and heat the whole, constantly stirring
until combination takes place, then pour it on metal plates
to form sheets. When used it must be heated to 248° F., and
applied with a brush.
Water-Proof Glues.—I.—The glue is put in water
till it is soft, and subsequently melted in linseed oil at moderate heat. This glue is affected neither by water
nor by vapors.
II.—Dissolve a small quantity
of sandarac and mastic in a little alcohol, and add a little
turpentine. The solution is boiled in a kettle over the fire, and
an equal
quantity of a strong hot solution of glue
and isinglass is added. Then filter through
a cloth while hot.
III.—Water-proof glue may also be produced by the
simple addition of bichromate of potassium to the liquid glue solution, and subsequent exposure to
the air.
IV.—Mix glue as usual, and then add
linseed oil in the proportion of 1 part oil to 8 parts glue. If it is
desired that the mixture remain liquid, 1 ounce of nitric acid should be
added to every pound of glue. This will also prevent the glue from souring.
V.—In 1,000 parts of rectified alcohol dissolve 60 parts of sandarac and as much
mastic whereupon add 60 parts of white oil
of turpentine. Next, prepare a rather
strong glue solution and add about the
like quantity of isinglass, heating the solution until it commences to boil; then slowly add the hot glue solution till a thin paste forms, which can still be filtered through a cloth. Heat the solution before use and employ like ordinary glue. A connection
effected with this glue is not dissolved by cold water and even resits
hat water for a long time.
VI.—Soak 1,000
parts of Cologne glue in cold water for 12 hours and in
another vessel for the same length of time 150 parts of isinglass
in a mixture of lamp spirit and water. Then dissolve both masses together
on the water bath in a suitable vessel, thinning, if
necessary, with some hot water. Next add 100
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