Information Bureaux and Special Libraries

Date:
20 September - 23 September 1929
Reference:
WA/HMM/CM/Sal/37/6
Catalogue details

Licence: Public Domain Mark

Credit: Information Bureaux and Special Libraries. Source: Wellcome Collection.

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    used for sheet feeding by means of a separate attachment. This must be used when it is required to print on the back of a sheet already printed, or to overprint in another colour. Prices. The prices are as follows: No. 7 machine about £200 and No. # about £325 ; the auxiliary automatic sheet feeding apparatus for these two machines about {60 extra. No. 7/7 machine about £145. Metal sheets cost about 7d. to tod. each, dependent upon quality and quantity. The cost of the other supplies, such as solution, etc., is quite small. The complete outfit for making photo mechanical transfers costs £46. These machines are marketed by Kaye’s Rota- print Agency, Ltd., 654, Holborn Viaduct, E.C.1. 4. (0) PHoroGRAPHIC IMPRESSION, DirECT REPRODUCTION (PHOTO- LirHo PRocgss). This process involves printing direct from a zinc plate without employing offset. In this way it differs from the Rotaprint machine, and the process is rather more limited in its application, as all repro- duction is photographically imprinted on to the zinc plates. Its principal uses are for making reproductions of printed and typewritten matter, including maps, plans, drawings, music, etc., and vety long runs can be made at low cost. The matter to be reproduced is photographed on to the zinc plate, the copy being placed between the light and the plate itself. That is to say, the photographic action is carried out through the copy. It is therefore only possible to copy both sides of paper printed on both sides, if two copies are available and the text on one side can be cleaned ot rubbed off in each case. If two copies are not available the matter could be separately photographed or photostated, and these photo- graphs used to prepare the photo-litho plates. When the zinc plate has received the photographic impression this is developed and fixed with a chemical liquid supplied only by the makers. Developing and fixing a plate is quite a simple operation, the liquid merely being rubbed in to the plate with a small cloth pad until the impression shows up clearly ; fixing is carried out in the same way. When the zinc plate has been developed it is mounted on the printing cylinder. The machine is power driven, but hand fed. The makers claim that speeds varying from 1,500 to 6,000 per hour can be achieved, depending mainly upon the size of the copy required and the skill of the operator, while as many as 50,000 copies can be obtained from one plate. The plates required are ordinary zinc plates obtained from any supplier of this type of material. The chemicals can, however, only be obtained from the manufacturers, but they appear to add very little to the running expense. Operation does not appear to require any special qualifications. Price. The price of the machine, with complete equipment, is £300. The suppliers will train an operator free. The training is understood to take about a week. The machines are marketed by the Photo Litho Process, Ltd., 57, City Road, London, E.C.1.