———~——-” 
452 
the tints, lines, or figures, alluded to, 
white instead of black; so that where 
jn the common way the paper is covered 
with black or coloured ink, the new me- 
thod is to leave it uncovered, and vice 
versa: or instead of producing dark- 
figures on a light ground, to produce 
light Ggures on a dark ground or surface, 
or on a ground darker at least than the 
figures themselves. In the second place, 
instead of representing all figures by 
black tints or lines, or black figures, as 
now commonly represented on a white 
ground or surface. Mr. S. can adopt 
any other coloured ground or surface, 
taking care always to produce the advan- 
tageous combinations of the two arts of 
engraving and letter-press printing, that 
Is to say, the dispatch and economy of 
the latter with the effect and general 
utility of the former, ‘* a combination,” 
says he, ‘* hitherto wished for in vain, 
and from which, it may be obvious, very 
essential results will arise both to the 
artists and to traders in the arts, and, in 
‘fact, to the public, that will no doubt 
be actuated by interest to encourage a 
new invention, which may afford an ex- 
traordinary gratification by a speedier 
mode of intelligence, through a cheaper 
medium.” 
The engravings of the figures may be 
cut or stamped on plates of brass, cop- 
per, tin, pewter, type-metal, or wood, 
or any other substance on which engrav~ 
Ings can be made; and, for the better 
adapting, the ground or surface of the 
plate, or for the better rendering the 
ground or surface fitin all its parts for 
the proper reception and adhesion of 
that kind of ink used by letter-press 
printers, so as to produce a clear and 
an equal impression on all its parts at 
ence, he causes dots or lines to be cut, 
marked, or stamped, or drawn across the 
ground or surface of the metallic plates, 
or other substauce; or corrodes it with 
aquafortis, so as to produce a sufficient 
degree of roughnessfor the adhesion of 
the particular ink” now mentioned ; 
leaving the figures or subject of the plate 
orengraving, untouched by such, dots or 
tines. The part of the surface which is 
not engraved upon, instead of being made 
Patents lately Enrolled. 
[June 1, 
as smooth as possible, as in copper-plate 
engravings, ought to be made sufficiently 
rough, either by mechanical or chemical 
means, so as to make the ink, applied by * 
the letter-press printer’s balls, adhere in 
a way nearly equal, or in such quantity 
or proportion as is wanted or intended, 
The last preparatory process of the plate 
for the letter-press, previously to its being 
printed as described, is by fixing it on a 
wooden block ; or by grooving it on a 
brass or other metallic standard; or by 
fixing it on a clay or earthen substance 
or cement; taking care that the whole 
body thus formed shall not be higher or 
lower than the types commonly used at 
the Jetter-press; and also taking care, 
that it be calculated in every degree to 
be embodied as‘it were with the letter- 
press printer’s form or types, so as to 
produce, by the very same operation of 
the letter-press, the impression of hoth 
the plate and the types at one and the 
same time, or by one and the same pul 
of the letter-press_ printer, and on the 
very same sheet or piece of paper. Or 
the plate or plates thus prepared, may, 
if on particular occasions deemed more 
expedient, be worked, off alone at the 
letter-press, so as to produce the in-= 
tended effect of engraving with the faci+ 
lity and dispatch of multiplying copies 
agreeably to the nature or principle of 
operation peculiar to the letter-press, 
“ Tis by the means now desepibed o7 
specified,” says Mr. Stuart, ** combine, 
or unite, for maps, charts, music, anato- 
mical figures, or any figures or repre- 
sentations of the human body, or for all 
or any of the other figures already men 
tioned, performed in my manner, the se~ 
parate arts of the.copper-plate engraver 
and the letter-press printer, by engraving 
as engravers usually do, and by printing 
as printers usually do; thereby render~ 
ing, by the application of these united 
arts in the printing of books, magazines, 
newspapers, periodical publications which 
require dispatch, a very great saving or 
abridgment of time, labour, and expence, 
in the exercise of both arts, and conse- 
quently a very great convenience ang 
advantage to the public at lange.” 
NEW 
