A402 Miscellanies. 
zinc plate thus prepared is to have poured over it a solution of gum in di- 
luted phosphoric acid. This fluid is attracted by those portions of the 
plate that the acid has previously attacked and moistens them without diffi- 
culty, whereas it is repelled by the oil contained in the transferred portion 
of the printer’s ink. The plate is now to have an inked roller passed over 
it, whereby the very reverse action is brought about. The repulsion be- 
tween the oil of the ink and the moist surface of the plate over which the 
roller is passed, prevents the grease from adhering to those portions of its 
surface upon which there are no printed lines or strokes, while from the 
attraction of oil for oil, the ink is retained upon all the printed parts. The 
Anastatic plate is thus ready for use, and impressions may be thrown off 
from it as in the ordinary lithographic process. 
Prof. Faraday described likewise the method of obtaining, by the 
Anastatic process, copies of antique originals, the ink of which is no 
longer transferrable by simple pressure. The process is as follows :— 
The printed paper is first to be laid in a solution of potash and subse- 
quently in a solution of tartaric acid. The consequence thereof is that 
all the blank portions of the paper become penetrated by minute crystals 
of tartrate of potash, and as this salt repels water, an inked roller may 
then be passed over the surface of the paper without the ink adhering to 
any parts but where the ink of the impression is. The tartrate is then to 
be removed by careful washing, and the operation proceeded with as 
above described, beginning by moistening the paper with dilute nitric 
acid. 
The February number of the Art Union informs us, that as yet the 
Anastatic process is only used in London, and that on a small scale, at the 
printing office cof Mr. Wood, Bargeyard Chambers, Buchlersbury. The 
impressions which it is desired to reproduce may be either from recent or 
from old originals, (a hundred years old indeed or more;) their age is 
quite immaterial ; the copies produced being in every case equally ex- 
cellent, so much so indeed, that they are not to be distinguished from the 
originals themselves. 
By means of this process old or faded engravings and etchings may 
be so renovated as to have all the appearance of recent impressions. One 
special merit in the invention lies in the method resorted to, and that with 
complete success, for preventing the extension of the ink when exposed to 
any pressure to which it may be submitted, and by which means the finest 
lines and the sharpest outlines are reproduced with the greatest precision. 
When ordinary type is transferred by this new process to a zine plate, the 
impressions which the latter affords have precisely the appearance, as 
they leave the press, of being taken from metal types; and as in this new 
method of printing the impressions are not transferred to stone but to 
zinc, which may be used with the ordinary steam-presses in the form of 
cylinders, we have it in our power to multiply to any extent both text and 
