Part 12 (2/2)

A inal drawing, 14 11-1/2 in) Reproduced by zinc process

This artist learned the method of line work for process in a month]

CANTOR LECTURES

The ILlustRATIONS in this Volus which--for purposes of study and comparison--are shown by Mr Blackburn at his Lectures in Art Schools, enlarged to a scale of 15 to 20 ft

Students who may be unable to attend these lectures can see sos on application (by letter) to ”The Secretary, at Mr

HENRY BLACKBURN'S STUDIO, 123, Victoria Street, Westminster”

APPENDIX

1 PHOTO-ZINC PROCESS--2 GELATINE PROCESS--3 HALF-TONE--4

INTAGLIO PROCESSES--5 DRAWING MATERIALS--6 BOOKS FOR STUDENTS--7

DECORATIVE PAGES--8 LIST OF PHOTO-ENGRAVERS

PHOTO-ZINC PROCESS

FOR THE REPRODUCTION OF LINE DRAWINGS IN RELIEF, SUITABLE FOR PRINTING AT THE TYPE PRESS

DESCRIPTION OF THE PROCESS--The first stage is to have the drawing photographed to the size required, and to transfer a print of it on to a sensitized zinc plate This print, or photographic ireasy substance (bi+chroelatine), and is afterwards inked up with a roller; the plate is then immersed in a bath of nitric acid and ether, which cuts away the parts which were left white upon the paper, and leaves the lines of the drawing in relief This ”biting in,” as it is called, requires considerable experience and attention, according to the nature of the drawing Thus, the lines are turned into metal in a few hours, and the plate, when ht of type-letters, is ready to be printed from, if necessary, at the rate of several thousands an hour

THE COST of these blocks averages 6d the square inch where a nu 5/-

Small book illustrations by this process, by firle illustrations, are often charged 9d the square inch, with a minimum of 7/6; but the cost should never be le block by the zinc process

GELATINE PROCESS

FOR THE REPRODUCTION OF DRAWINGS IN LINE IN RELIEF, SUITABLE FOR PRINTING AT THE TYPE PRESS

This is aa relief block It is called the ”gelatine,” or ”Gillot” process

The drawing is photographed to the required size (as before), and the _negative_ laid upon a glass plate (previously coated with a elatine and bi+chromate of potash) The part of this thin, sensitive filht is absorbent, and when iht, _ie_, the lines of the drawing, relass Thus we have a sunkthe lines in relief as in the zinc process In skilful hands this process adradations, and pale, uncertain lines can be reproduced with tolerable fidelity There is no process yet invented which gives better results fro for the type press