Improvements in Grained Screen Plates for Photo-mechanical Process Work.
Year: 1895

page_text: Date of Application, 16th Oct., 1895
Complete Specification Left, 16th July, 1896-Accepted, 22nd Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Grained Screen Plates for Photo-mechanical
Process Work.
JOHN BYROM Violin Maker 37 Renshaw Street Liverpool do hereby declare
the nature of this invention to be as follows:-
The improvements consist in making a screen, or grating, which is at once
indestructible, and at the same time having absolutely clear glass, at a lower level
than the opaque lines or dots.
In making the screen, the glass-plate is first coated with varnish, or it may be
inked with a printers roller, and afterwards dusted with enamel color, or the color
may be mixed with the ink or varnish, when applied.
The plate may then be ruled, either before it is burned in, or afterwards.
If ruled after firing, it is coated with a suitable resist, then ruled, and after-
wards etched with hydro-fluoric acid, through the opaque enamel color, to the
clear glass beneath.
.1
I also rule and etch a metal plate, which is then inked up like a copperplate,
and the impression therefrom transferred to the clear gl, afterward, dusting the
enamel color onto the glass, before being burnt in in the kiln.
Any kind of grain may be used, as for instance a reticulated gelatine film may
be inked up and transelled to the glass, in which case the prominences or tips
of the film will leave the ink in dots to which the powdered color will adhere,
when dusted on.
An impression can also be taken from an ordinary litho-grain plate and trans-
ferred to the glass, afterwards dusting the color thereon.
Dated this 15th day of October 1895.
JOHN BYROM.
COMPLETE SPECIFICATION.
Improvements in Grained Screen Plates for Photo-mechanical
Process Work.
JOHN BYROM Violin Maker 37 Renshaw Street, Liverpool do hereby
declare the nature of this invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
The improvements consist in making a screen or grating which shall be
indestructable, and at the same time have a clear plane glass surface at a lower
level than the opaque lines or dots.
In making a screen under one modification, a glass plate is first conted with
varnish or with printers ink, or other suitable substance, and afterwards dusted
with enamel colour, or such colour may be mixed with the varnish or ink or other
suitable substance when applied.
The plate is then ruled, and afterwards fired in a kiln to fix the colour in the
lines or dots.

page_text: If desired the plate after being coated with enamel colour, may be fired before
being ruled, and in this case, in order to form the lines or dots I coat the fired
plate with a suitable resist-then rule through the said resist to the enamel
colour, and afterwards etch through the enamel colour to the plane glass. By this
means a plate is pro luced of which the grained surface is not liable to be damaged
by rough or careless usage.
I do not confine myself to ruling the plate as above described, as various methods
of producing the screening or graining may be employed as found convenient as
for instance an impression may be taken from a rule or etched metal plate, or
from a reticulatel gelatine film or collotype tissue, and such impression applied to
the plate, which is then dusted with enamel colour and fired as above described
or inny transfer direct from the gelatine film or collotype tissue, or 1 may apply
the resist above the fired enamel colour, in the form of a powder and preferably in
a rosin dusting box, so as to obtain a grain, afterwards heating the plate to melt
the dust and fix it and then etch through to the clear glass.
Or the enamel colour may be dusted on to the varnished plate so lightly as to
form a grain and thus dispense with ruling or transferring.
Having now particularly described and ascertained the nature of my said inven
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. A sereen plate or grating, the screening or graining of which is formed of
enamel colour fixed and burned into the glass by firing in a kiln.
Dated the 15th July 1896.
JOHN BYROM.