192 THE YOUNG 
— Joseph Albert, photographer to the court at 
Yienna, has finally succeeded in inventing pho- 
tography to render the natural colors in the pic- 
ture by a photographic steam press of his own 
construction, without the aid of a pencil. An ex- 
pert painter could hardly give the colors of the 
•object more faithfully in living reality and with 
the distinctness to the nicest shades than in these 
colored photographs by the Albert press. The 
secret of the invention consists in the analysis of 
the white light into three colors, yellow, blue, 
and red, and in tlie recovery of the three colors 
ready for the press. Ol' a plate, chemically pre- 
pared so as to receive but che yellow parts of the 
light, and the tones of the colors of the object to 
be reflected, the first photograph is taken, wlien a 
negative of that plate is at once put under the 
press, whose cylinder is dubbed over with yellow 
paint. None but the tones of the yellow colors 
are now seen in the impression. After that the 
object is photographed on the plate made to re- 
flect but the blue colors. This plate now under 
the press reflects a blue impression, the cylinder 
being dubbed over with blue paint. In the same 
manner it receives but the tones of the red colors 
by means of a third plate. Printing the individ- 
ual pictures of the yellow, blue and red over each 
other, a picture is produced true to nature, the 
colors intermixing by having been printed over 
each other. The idea, long entertained and pros- 
ecuted by Albert, to photograph colors, may no 
longer bo considered as not feasible. It is very 
hard at the present time to foretell how gre;it a 
revolution this new invention will produce in the 
many departments of art. 
|lrattital pints. 
Cement for Fastening" Wood to Stone.— 
Melt together 4 parts of p.-iteli and 1 of wax, and 
add 4 parts of pounded brick-dust or chalk. It 
must be warmed before using, and applied 
thinly to the surfaces to be joined. 
To Produce Imitation Ebony.— Take half a 
gallon of strong vinegar, one pound of extract of 
logwood, a quarter of a pound of copperas, two 
ounces of China blue, and one ounce of nutgall. 
Put these into an iron pot and boil them over a 
slow Are till they are well dissolved; when cool 
the mixture is ready for vise ; add a gill of iron 
filings steeped in vinegar. The above makes a 
perfect jet black, equal to the best black ebony. 
A very good black is obtained by a solution of sul- 
phate of copper and nitric acid; when dry, the 
work should have a coat of strong logwood stain. 
— BilmeacVs Practical French Polisher. 
To Imitate Ground G-lass.- Put a piece of 
putty in muslin, twist the fabric tight, and tie it 
into the shape of a pad. Well clean the glass 
first, and then apply the putty by dabbing it 
-equally all over the glass. The putty will exude 
«uffl«iently through the musliu to render the 
SCIENTIST. 
glass opaque. Let it dry hard and then varnish. 
If a pattern is required, cut it out on paper as a 
stencil plate, and fix it on the glass before apply- 
ing the putty ; then proceed as above, and remove 
the stencil when the dabbing is completed. If 
there should be any objection to the appearance 
of clear spaces, cover them with slightly opaque 
varnish. 
In continuing this department, which has been found of 
so much value, we would remind our readers who wish for 
information on any of the arts and sciences, that they are 
cordially invited to make their wants known through this 
column, and those of them who can furnish accurate 
answers to questions asked are requested to send in replies. 
Doubtless many of our subscribers may know of methods, 
processes, or devices that may be better or more suitable for 
the particular c?se in question than anything generally 
known, and it is this reason that induces us to keep this de- 
partment open for a medium, where an interchange of ideas 
and practices may be made to the advantage ot all our 
readers.^ Correspondents will please send their full address 
when forwarding their communications — either questions or 
answers — not for publication, unless expressly so stated, but 
so that we may know where to find the w iter if desirable. 
Comm unications should be sent in on or before the first of 
each month previous to publication, to insure insertion in 
next issue. 
Answers. 
71. Oil Coloks.— A set of materials, and oil col- 
ors for flower painting could be made up for from 
five to eight dollars. You could paint on, paper 
or on wooden panels. If you desire the former 
get a sketch block for oil ^Jnting. which con- 
tains 32 sheets, seven by ten inclies, for a dollar; 
ton by fourteen inches for two dollars. If you 
prefer wood you can get polished panels from 
forty cents up to $1.60 apiece. You can order at 
Devoe's, corner of Fulton and William streets. 
New York, sketch of daisies for plaque. You can 
also order at same place ail your materials men- 
tioned; also " Tilton's Outline Studies of Famil- 
iar Wild Flowers," in two parts, $1.50 each part ; 
and " Tilton's Familiar Garden Flowers," in two 
parts, each part illustrated by twenty chromo- 
lithographic plates.— Nettie, N. Y. 
72. Steamboats.— A kind of a steamboat was 
patented in England in 1737 by a man named 
Hull. His patent, and a pamphlet written by him 
setting fortli the great advantages of his inven- 
tion, are still in existence, Jouffroy tried Hulls' 
idea on the Saoue at Lyons in 1782. Miller, of 
Dalswinton, and Symington, tried their steam- 
boat on the Clyde in 1789. and accomplished seven 
miles in the hour. The Charlotte Dundas steam- 
tug was placed on the Forth and Clyde Canal in 
1801. A barge was propelled by steam on the 
Thames, at two miles an hour against tide, on 
July 1, 1801. Fulton's steamboat was tried, and 
collapsed, on the Seine, August 9, 1803. Having 
visited Symington, and taken notes of the Char- 
lotte Dundas, Fulton tried again, and success- 
fully, on the Hudson at New York, with one of 
Boulton and Watt's engines sent out to him from 
England in 1806, since which time steamboats 
have always been on the Hudson. The improve- 
ments made in steam engines by Boulton and 
Watt 'rPiiulered successful steamboating pos- 
sible. The Comet, the first passenger steamboat 
in Great Britain, started on the Clyde in 1811 ; the 
Norwich and Yarmouth boats began in 1813, the 
London and Gravesend boats in 1815. The first 
steam -packet to ci-oss the Atlantic was the Sa- 
vannah, which reaf'hed Liverpool in twenty-six 
days from New York on July 15. 1819. The fir.st 
English steamer from London to New York was 
