Part 13 (1/2)

Reproductions of pencil, chalk, and charcoal are also possible by this process; but _they are not suited for it_, and there is generally tooThese blocks when coer to make, and are about double the price of the photo-zinc process THE COST varies from 9d to 1/6 the square inch

M Gillot, in Paris, may be said to be the inventor or perfector of this process, now used by ravers in London, notably by Mr

Alfred Dawson, of Hogarth Works, Chiswick

HALF-TONE PROCESS

FOR THE REPRODUCTION OF WASH DRAWINGS, PHOTOGRAPHS, ETC, BY THE SCREENED PHOTO-ZINC RELIEF PROCESS

Thisthe blocks is , or in a photograph fro, it is necessary to obtain sorain, or interstices of white, on the zinc plate, as in a raph to be reproduced and the calass screens covered with lines or dots, are interposed, varying in strength according to the light and shade required; thus turning the iraph practically into ”line,” with sufficient interstices of white for printing purposes

The coarseness or fineness of grain on these blocks varies according to circu on cylinder rain and a deeper cut block is necessary

The examples in this book ood average printing The results froenerally gloo

The reproductions of pencil, chalk, or charcoal drawings by this process are generally unsatisfactory, even when printed under good conditions

The blocks are shallow as compared with the zinc line process, and are double the cost

INTAGLIO PROCESSES

PHOTOGRAVURE, AUTOTYPE, DALLASTYPE, ETC

PHOTOGRAVURE--First, a photographic negative is taken direct from the picture to be reproduced, and from this an autotype carbon print is taken and transferred on to glass or silvered copper, instead of on the paper used incarbon prints for sale This picture is in delicate relief, and forms the mould, upon which copper is electrically deposited After being alvanic bath, the deposit of copper upon it taking the impression perfectly

Another method is to transfer the same mould upon pure, clean copper, and then operate with a powerful biting solution, which is resistedthickness of carbon mould to be penetrated Thus the parts to be left smoothest are thick of carbon, and the parts to be dark are bare, so that the mordant may act unresisted

This, it will be perceived, is the opposite way to the process above given, and is therefore worked froraphic ”positive,” instead of a negative This is the Klick and Fox Talbot method, and is very coravure” is well known, as employed by Messrs

Boussod, Valadon, & Co (Goupil), of Paris, and is adapted for the reproduction of wash drawings, paintings, also drawings where the lines are pale and uncertain, pencil, chalk, etc; the greys and gradations of pencil being wonderfully interpreted In London the intaglio processes are used by e 240 They are now raphic portraits in books, taking place of the copperplate engraving

THE COST of these plates is, roughly, 5/- the square inch The enerally supply paper, and print, charging by the 100 copies But engravings thus produced are comparatively little used in modern book illustration, as they cannot be printed simultaneously with the letter-press of a book; they are suitable only for limited editions and ”_editions de luxe_”

DRAWING MATERIALS FOR REPRODUCTION

1--FOR DRAWINGS IN LINE--For general use, liquid Indian ink and Bristol board; or hard paper of similar surface ”Clay board,” the surface of which can easily be removed with a scraper, is useful for some purposes, but the pen touch on clay board is apt to becorained papers are used (see p

113 and following) These papers are made of various textures, with black or white lines and dots vertical, horizontal, and diagonal As a rained papers are little used in book and newspaper illustration in this country, and unless artistically treated the results are very unsatisfactory They are most suitable for landscape work and sketches of effect

3--FOR WASH DRAWINGS--Prepared boards for wash drawings, varying in surface and texture according to the scale of the drawing, the brush handling of the artist, and the nature of the work to be reproduced

These must be decided by the teacher Lamp black and opaque white are coenerally to be avoided

Thefor reproduction are to be obtained frost other artists' colourent Street, W