Printing; a practical treatise on the art of typography as applied more particularly to the printing of books; by Jacobi Charles Thomas 1853-1933

Author:Jacobi, Charles Thomas, 1853-1933
Language: eng
Format: epub, pdf
Tags: Printing
Publisher: London : G. Bell and sons
Published: 1890-03-25T05:00:00+00:00

his impression sheet without ink. Before lifting the tjmpan up two holes should be pricked with a pin or needle right through the tympans at both ends, in order that when this sheet has been patched up (i.e., made level), it can be placed between the tympans in its exact position by means of the corresponding holes, pasting it at the coi'ners to prevent shifting. After the impression sheet has been pulled, it should be taken to a well-lighted place and turned face downwards on an inclined board. By choosing a good light the impression made can be seen by a side glance. Where the type stands high it should be cut away, and where low it should be patched up with the very thin setoff paper—corners and pieces of this paper being torn oif to the required shape and pasted on the parts which do not come up well—thus equalizing those parts that originally stood high and low. When this is done, it can be placed into its position as before explained, and a second and third sheet, if necessary, pulled in the same manner and examined, till the whole forme has been well brought-up. Before pulling the first sheet, we should have said that if the forme is not a solid one, that is, if any of the outer sides of the type are short or entirely blank, the absence of printing surface must be compensated for by the substitution of a bearer in the shape of anything type-high,—a metal clump for preference. If possible, this bearer should be so placed that it will not be impressed on the paper, because it leaves an ugly mark which will not come out in pressing the sheets afterwards. It should be placed just beyond the extreme edge of the paper opposite to the short or blank page ; this plan obviates any possible hardness of impression on that part of the printed sheet. The bearer can either be fastened with the locking-up materials which hold the forme to the press or stuck down with melted roller composition.

Gutting thefrisket. —After the impression has been levelled, this may be done. To prepare for it, it is best, in the first

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