Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1915-12-10
CHAPTER XIII
A FEW POINTS ABOUT HALFToNEs.

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Engravings, rule are Unfortunately referred
cuts whether they be hafones zinc echings what
not Hatone engravngs probably the most used These
the kind that look like photographs They must be made
either from photographs wash drawings They OF great
est value in Photographic reproduction.
haftone is called because it permits not only of
black and white such for instance ordinary reading mat
ter allows but it also makes possible intermediate tone be-
tween the black and whiten other words In fact
the haone presents many different shades of gray In that
way it accompishes Photographic reproduction.
You readily understand how black impression
made sheet of paper and how not printing anything
on certain portions of white paper will leave white space
but to how the haftone with the metal surface prints
black here and gray right above that the puzzle.
The hafone is made with senstized plate They put
between this senszed pate which is in the
and the ''copy'hat is the photograph wash drawing
which is be reproduced This simply piece of
glass divided by diagonal lines running from upper left
to lower right which lines nersected by similar set of
lines running from lower left upper right Thus you see
these lines divide the into little diamond shaped
islands In other words the lines would hide from the
senszed plate corresponding lines the copy and would
expose to the senstzed plate the little parts of the copy
which could "peek" through the little open sands' be-
tween the nesecng lines of the between the plate
and the picture.
So the balance of the surface of the copy, the clear
spaces between the interesting lines would reach the sens
zed plate and thereon would record themselves And so
you look at haone through microscope you will that
lit is made up of thousands of little spmpe like" bumps
and that there thousands of little valleys dug from the
nterposed between the copy and the enzed plate dur
ing the exposure. - S. #t~=#@6
For the sake of Installation suppose that these little
bumps the plates mountains and the little lines de-
pressons which may call valleys Here for instance
spot the plate which will reproduce the black hair of mans
head At this point the little valleys very very narrow
and the tops of the little mountains ubby and broad
Over yonder there part which is to reproduce the light
gray of Here find that the open spaces of the
valleys wider and the tops of the mountains proper
onatey thinner It is these mountain tops which touch the
paper and these thn they leave but little spot of ink
If they thick they leave big spot of ink The latter of
course would be darker than the former
That explains how haftones make possible variations
the shades grays and blacks As rule these made Of
copper metal although sometimes they may be made of zinc
Engraving plates are "blocked" "unblocked,'' &C
corng to whether there wooden base to which the metal
tackled This wooden base of sufficient thickness so
to printing surface exactly deep the ordinary
type.
Haftones divided three main divisions according
to the way which they finished. If they simply
like ordinary photograph they called
square haftones If they are ouined IF the background
is cut away-they called silhouette hatones the back
ground Immediately surrounding the objects gradually fades
off from clear impression to haziness and finally into moth
nghen the haftone is said to have vgnetted' finish
Haftones also divided to screensn other words,
neness haftone usually about
6screen called This refers to those diagonal lines which
run parallel across the screen which originally placed
between copy and the senszed plate at the time the
negative taken. In haftone these lines be
apart 60 of them to inch When they
closer the haftone therefore finer They be close
that 200 of Them side by side will only inch
width = +. i'll. .... IL. ,
is kind that usually feasible for ordinary
because the surface of the newspaper is often
that haone of finer would
blur and blot On fine surfaced papers, however such mag
and books the haone OF about 13screen is the best
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