IMPROVEMENTS RELATING TO THE PREPARATION OF METALLIO PLATES FOR ETCHING
Year: 1884

page_text: I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for "IMPROVEMENTS RELATING TO THE PREPARATION OF METALLIO
PLATES FOR ETCHING" to be as follows:-
This invention relates to a method of preparing metallic plates so that dots are
left standing in relief wherever portions of the surface of such metallic plates have
been etched away,
In order to effect this object I take a sheet of foil of copper, zinc or other
suitable metal, one four hundredth of an inch in thickness, or thinner if required,
and pass auch sheet of foil between a pair of Goldsmith's rolls, the surface of the
lower roll of which is engraved to form dots, by first making fine grooves running
parallel with its length and then circumscribing the roll with fine grooves cut at
right angles to the grooves first mentioned. By this operation the foil will receive
an intaglio impression of the dots on the roll. The sheet of foil is then laid down
on a sheet of glass or other suitable material with the impression side up and the
outer edges secured, to hold it level, with varnish or other tenacious substance
suitable for the purpose.
If the foil which has been impressed by passing between a smooth and an
engraved steel roll in the manner above described be of copper, it is next immersed
in any of the well known electroplating baths suitable for the purpose and plated
with a thin but perfectly adhesive deposit of silver, platinum, or other metal which
will remain unaffected by the acid which is subsequently used to etch away
portions of the smooth side of the copper foil to expose the surface of the under-
lying deposited metal. If the foil which has been impressed and held level in the
manner previously described and referred to be of zinc, or any other metal, it is
plated, in a similar manner, with copper or any other metal which will withstand

page_text: the action of the acid subsequently used to etch away the surface of the foil to
expose the surface of the substanco or deposited metal.
To give effect to my process in all cases the foil must be of the metal most
affected by dilute nitric, hydrochloric or sulphuric acid which foil must then be
plated with any other suitable metal which is not so much, or not at all, affected
by any of such acids. After removal from the electro-plating bath the foil is
washed in clean water and dried, and after being " backed to the requisite
thickness with type-metal in the same manner as an ordinary electrotype, is
complete.

page_text: I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings in the County of Middlesex do hereby declare the nature
of my invention for "IMPROVEMENTs relating to tHE PREPARATION OF METALLIC
PLATES FOR ETCHING" and in what manner the same to be performed, to be
particularly described and ascertained in and by the following statement:—
This invention relates to a method of preparing metallic plates so that dots are
left standing in relief wherever portions of the surface of such metallic plates have
been etched away.
In order to effect this object I take a sheet of foil of copper, zinc, or other
suitable metal, one four hundredth of an inch in thickness or thinner if required,
and pass such sheet of foil between a pair of Goldsmiths' rolls, the surface of the
lower roll of which is engraved to form dots by first making fine grooves running
parallel with its length and then circumscribing the roll with fine grooves cut at
right angles to the grooves first mentioned. By this operation the foil will receive
an intaglio impression of the dots on the roll. The sheet of foil is then laid down
on a sheet of glass or other suitable material with the impression side up and the
outer edges secured, to hold it level, with varnish or other tenacious substance
suitable for the purpose..
If the foil which has been impressed by passing between a smooth and an
engraved steel roll in the manner above described be of copper it is next immersed
in any of the well known electroplating baths suitable for the purpose and plated
with a thin but perfectly adhesive deposit of silver, platinum or other metal which
will remain unaffected by the acid which is subsequently used to etch away
portions of the smooth side of the copper foil to expose the surface of the under-
lying deposited metals. If the foil which has been impressed and held level in the
manner previously described and referred to be of zinc, or any other metal, it is
plated, in a similar manner, with copper or any other metal which will withstand
the action of the acid subsequently used to etch away the surface of the foil to
expose the surface of the substance or deposited metal.
To give effect to my process in all cases the foil must be of the metal most
affected by dilute nitric, hydrochloric or sulphuric acid which foil must then be
plated with any other suitable metal which is not so much or not at all affected by
any of such acids. After removal from the electroplating bath the foil is washed
in clean water and dried and after being "backed" to the requisite thickness with
type metal in the same manner as an ordinary electrotype is complete.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
The method of preparing a sheet of metallic foil by impressing or perforating it
and then by plating it with another metal that will remain unaffected by the same
acid which is used to etch away the foil so as to expose the surface of the deposited
metal, substantially as and in the manner above described,
HASELTINE, LAKE & Co.,
For the Applicant.