SCIENTIFIC SUMMAEY. 
259 
ready for the printing frame. When printed it is fixed” (?) hi a bath of 
acetic acid, hi which it should remain some ten or twelve minutes, and it 
is afterwards placed on a sheet of plate glass and thoroughly washed under a 
stream of water with the aid of a sponge or brush. 
Another Neio Process. — Another process, with a somewhat more legitimate 
claim to novelty, perhaps, and which produces pictures surpassing in artistic 
delicacy, brilliancy, and beauty of detail and finish all we have seen, has been 
even more recently described in the pages of the British J ournal of Photo- 
graphy. This is called the “ Too^'y-type ^irocess,” and is thus carried out : 
A piece of white opal glass, the surface of which has been ground perfectly 
smooth, is first coated with albumen. To prepare the albumen for this 
purpose thirty grams of chloride of ammonium, or sodium, are added to the 
whites of three fresh eggs in a perfectly clean ten-omice bottle. To render this 
more limpid and homogeneous, three or four drops of strong ammonium are 
added to the mixture, which is then violently shaken until the whole is 
beaten into a froth. After standing for twenty-four hours the albumen thus 
prepared is filtered through two or three folds of muslin, and is ready for use. 
The gTound surface of your aforesaid glass being washed under a tap in run- 
ning water, and rubbed with, say, an old tooth or nail brush, thoroughly freed 
from soap, is next dried and coated with the albumen. The latter process is 
aided with a glass rod or camel-hair brush ; air bubbles and particles of dust 
must be carefully avoided. When covered the plate should be tilted over 
the bottle so as to allow the superfluous albumen to flow back, and the plate 
moved in the same way as is done when coating a glass with collodion. 
After draining it is put carefully aside to dry spontaneously, and when this 
is accomplished it is sensitized in the ordinary way in a silver bath, which 
has just previously been filtered. In this bath it should remain about two 
minutes, and when that time has expired it should be allowed to dry, si^on- 
taneously, in the dark. After being printed on from a negative in the ordi- 
nary way, it is next taken from the pressure frame, washed, and toned in the 
usual alkaline gold-toning bath, and fixed, just as common silver j)i“ints on 
paper are, in a strong bath of hyposulphate of soda. Then, being washed 
and dried, the print is finished, and will be recognized as one of the most 
pleasing and attractive specimens of this wonderful new art. 
The Dublin Exhibition. — Active exertions are being made in various 
quarters, official and photographic, to secure an unusually creditable dis- 
play of photographic art at the Dublin International Exhibition, which is to 
be opened in May, 1865. The committee entrusted with the management 
of this department announce the fine art claims of photography as thoroughly 
recognized, and describe a system of classification very superior to that 
adopted by the Commissioners of 1862. 
Neio Lens. — An optician in Philadelphia has recently introduced a new 
lens, for which he claims many qualities of no small importance, viz., a flat 
field, wide aperture, and unusual clearness and sharpness in the images 
produced. It consists of two achromatic lenses, one 2| inches in diameter, 
[ with a focus of inches ; the other, an aclmomatic negative lens, similar in 
|1 construction to that of the well-known orthoscopic combination. If the 
claims advanced are well founded, this new lens will be a welcome addition 
to our photographic appliances. 
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