The Somerset reporter., 1892-07-21
BOOK ILLUSTRATION.
a LUCID EXPLANATION OF SOME
DIFFERENT PROCESSES.


The piferenc' h"'"ee" 'h""p ana
COST, Work Made Plain t" Buyers
V.;,b RI. i,cre,s;ne, psa of half tona
-. 40 tho numerous nrnco.sos for
II. ,ii,.,.,+ior tbo4 b,,., hoo,, d.,-ol
80 a.. ,d,,tad dur,,g tho mast ton ar
bftaan wears thor, has steadily grown a
ta,d.,,.,. -, tho mart af ,nhlisLor. rro,..
ass mo-, a,d in so,ne instances ,,,non,
.r;,ics to a,n1v entirely ,n,nnrnnriata
,,,,,as :, tba r.,,r,,ln,.ii,ns that ire mis-.
Io,a;n,, in tho extre,na and cannot lint
40 an ,.inrv tn tbn better classes nf vorl,
~. ,,i,.,n,, tboir name. l., nrn,.ess,.s ,,ucb
thoir ;nfe,;or. in nualitv
Lot a. first consider the ordinary half
tone nh,toengra,,n,, az which so mncb
has Iately been som IN the way of illus.
trat,ons for the HIGHER class periodicals
and ,vorl.s If an and technical nature
sban find that those rri,,,s nj rcudor
the half tone Of the original. or. to be
los ,.,.bni,.,l sbn,, tho varion. d,.,,raas
of lob, and .b,d, IN nass.s of color
diffcring IN 1,sr.e Inn in fiat tiuts nro-
ducod lay braoi,ip, The ori.yinal snhiect
may have beon either a wa.b DRAWING
n,inti,., IN c,lo, nor.r,it from Gf, ar
view from nature into and immense
number of dots obtained by photosranb.
inc tbronoh rho fine ,nasbrs Of n rnIea
US 'a ~, ,,a,.o,.,. - A.,
s,r;,,t;a,, hor,
The resulting nicture l. transferred To
r,a ,no,,I ,ha+ - =, s,,,,., - Tho s,,;sbod
,l,.a. ,ha ,Ion,irol ,,.,;,,,, :. ,,r,,,.,,,,,l,J
Iii, .,,,5 ,l,a haIf ,nu,,,l,f,. ~, ro.,,lt.
sha,,s tho ,ic,u,. ~ rolint ND tha ON
ti, .,,,,.f.,,i,, ,,f t,,o ,iat.. ,,,,,s ~ e,,a
nn;n,s or dots sonar,tnd Inv fin, fnrrn,ys
,,,,,,,;,,,, !, ,r,,,s,,a,.,., i,ra,,i,rs tLo
,,o;nts :, elf ba;no tho n,,nti,c, en-,
e., III ,,1o,, h,in,, t,1,oiaa -, ',.,,,a
or metal IN r.ndor il If tho s,me ba;gbt
AZ tvna II Is inkod ~, with a rolIar in
tba sa,,a ,,,,nor tbat ,,.na 10 and tho
;nk ndher;ny IN tho points IL ;mnrossed
into the naner that il hroupbt in contact
with them in the printing press
THE HALF TONE ENGRAVING.
1t should here be noted that the points
or dots making up the printing surface
of the plate, being all of the same height,
the amount of ink deposited ON the paper
is of the same depth or thickness from
each and every printing point. and if
naturally follows that variations in the
light and shade making up the picture
are dependent on the number and size
of such dots within given radius; thus
a heavy shadow in il picture printed
from relief plate will be seen TO be com
posed of large number of these Cots.
often so close together as to merge into
one another, while the high lights are
the result of preponderance of the
clear transverse lines that serve to sep
arate the dots more widely, only show.
ing them sufficiently to give form and
color to their object.
The above are the principal points of
Identification of "A print made from
half tone type plate in relief and are
easily to be distinguished from pictures
produced from intaglio plates There is
still another kind Of half tone relief
work, however, that is not so easily dis
tinpuisbed. and this is the photoeelatine
or heliotype and kindred processes. which
i'm rendering the rradations of color do
not cut them up into dots, but Law the
ink in smooth masses of different tones
on the paper from surface of gelatine.
PRINTING FROM AN INTAGLIo PLATE.
The nhotopravure is printed from an
;nt.olio nlate and is not capable of be-
ing used in type press under any con-
nr;nted bv an exnort and where with a