233 
NEW INTENTIONS. 
Hardening and Colouring Gypseous Limestone. — Mr. R. A. 
Brooman , patentee . — In hardening gypseous limestone, the stone is first 
reduced to pieces of artistic dimensions, such as are suitable for balus- 
trades, friezes, columns, &c. They are then dried in a stove heated to a 
certain temperature. After removal from the stove, the pieces of stone 
are placed in a bath containing a mineral solution. The bath may be 
composed of lime-water, sulphate of iron, cyanides, alumina, potass, 
soda, or vegetable substances, perfectly combined with minerals or 
substances obtained from alkaline matters. For colouring, recourse is 
had to a chemical operation, whereby a transformation of colours is 
obtained, by making one solution to chemically succeed another. 
Treating Gases containing Sulphuretted Hydrogen, — Messrs. 
Baggs & Simpson, patentees . — The objects of this invention are, firstly, 
to deprive coal-gas of elements which render it injurious to the animal 
and vegetable kingdom ; and, secondly, to manufacture useful products 
from or with the elements of which the coal-gas has been deprived. 
This is effected by causing the gas to come in contact with metallic com- 
pounds, by blowing or otherwise, whereby the injurious adulterative 
matters are separated by decomposition or appropriation. The metallic 
compounds employed are mainly metallic oxides and salts, whether 
neutral salts, super-salts, or sub-salts, having a strong affinity or attraction 
for sulphur, carbonic acid, and other impurities, and which are themselves 
susceptible of renovation or recovery. The oxides and salts of copper, 
lead, magnesia, and other bases, may be used for these purposes. 
Making Dyes from Aniline. — Messrs. R. T. R. Mont eith, patentees . — 
Aniline red, which is made from aniline or one of its analogues, is mixed 
with a dry salt of aniline, and heated in a vessel, either hermetically 
closed or not, to a temperature of 390° Fahrenheit, and upwards, from 
one to six hours. The dyes thus produced are shades of brown, called in 
France “Cairs” and “ Havanne.” The brown dye maybe separated 
into two brown dyes of different shades, a part being soluble in boiling- 
water, and nearly all the rest in alcohol. The mass which results from 
heating the aniline red, and the dry salt of aniline, must be treated with 
a sufficient quantity of boiling water to dissolve out all that is soluble in 
it, and then filtered, and the residue treated with alcohol, and filtered. 
Both filtrates will dry brown, but of different shades. These dyes may 
be used at once for dyeing textile fabrics and yarns, or they can be 
purified by any of the methods in general use for purifying aniline 
colours before dyeing with them. 
Producing Colouring Matters. — Mr. W. E. Newton , patentee . — 
This invention refers to a process for obtaining from naphthaline a yellow 
