432 Miscellaneous Intelligence. 
6. New Lithographic Press.—Messrs, Taylor and Martineau, 
engineers, have, in consequence of the extension and import- 
ance of lithographic printing, been induced to construct a new 
press, which appears to combine every necessary qualification. 
It is simple, powerful, accurate, and cheap. Several errors 
which existed in the old presses are corrected in it. 
7. New Mode of printing Designs.—A discovery has been 
made in the department of Calvados in France, by which the finest 
strokes of the crayon, or pencil, upon porcelain, may be infi- 
nitely multiplied. These strokes, traced with a particular 
metallic composition upon the polished surface of porcelain, 
are incrusted by the second application of fire, without the 
slightest injury. The parts thus delineated acquire a sort of 
roughness, insensible to the touch, and only to be discovered by 
its perfect retention of ink, which is easily wiped.off the other 
parts of the surface. This method seems to have decided ad- - 
vantages over lithography. 
We can guess at the nature of the above invention, but the 
description, which is from the European Magazine, is too im- 
perfect to admit ofa probable estimate of its value. 
8. Artifictal Slates.—A species of artificial slates have been 
used in Russia, which are said to be yery valuable, as being lighter 
than common slates, impermeable to water, incombustible, and 
made of any required form or size. They have been analyzed by 
M. Giorgi, who finds them to consist of bolar earth, chalk or car- 
bonate of lime, strong glue, paper pulp, and linseed oil. The 
earthy materials are to be pounded and sifted; the glue dis- 
solved in water; the paper is the common paper pulp, which, 
after being steeped in water, has been pressed, or it may be book- 
binders or stationers’ shavings boiled in water and pressed. The 
linseed oil is to be raw. The paper pulp is to be mixed ina 
mortar with the dissolved glue, the earthy materials then added 
and beaten up, and the oil added during the beating as fast as it 
is absorbed. The mixture is then spread with a trowel ona 
plank, on which a sheet of paper has been laid, and surrounded 
by a ledge, to determine the thickness of the layer, and is then 
turned out ona plank strewed with sand to dry. When dry 
they are passed through a rolling mill, then pressed, and finally 
finished by a coat of drying oil. 
The following are some of the various proportions recom- 
mended : 
2 parts paper pulp, 1 glue, 1 chalk, 2 bole earth, 1 linseed 
oil; this forms a thin, hard and very smooth sheet. 
3 parts paper pulp, 4 glue, 4 white bole earth, and 4 chalk, 
oil ? produce an uniform sheet, as hard as iron 
