As it is said that the French Government took possession of the
machine and preserves its mechanical construction a secret, we know no
more about it than about the much vaunted Napoleon cannon.
S.S., of N. Y.--"Please give the ingredients of the composition used for
tipping matches." Different manufacturers employ different materials and
in varying proportions; the mixture of phosphorus melted and stirred up
with thin glue is sufficient, although some add a quantity of powdered
glass, niter, chlorate of potash, sulphur, etc. The phosphorus, however
is the light-producing material.
R.S.B., of N.Y., alluding to the inquiry of S.W.P., in No. 23, for a
waterproof paste. "Calico printers when they wish to leave white figures
on a dark ground use what they term a 'resist paste' to cover such
places as are designed to be unaffected by the dye. If the ingredients
of this paste were known it might be what S.W.P., desires." This "resist
paste" is 1 lb. of binacetate of copper (distilled verdigris), 3 lbs.
sulphate of copper dissolved in 1 gal. water. This solution to be
thickened with 2 lbs. gum senegal, 1 lb.
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