Bauhaus-Universität Weimar

The Imprint
Jackson, F. Ernest Mason, J. H. Johnston, Edward
Persistente ID:
Offset and Offset Machinery 
its inkers, dampers and impression cylinder, but there is the addition of 
the extra cylinder, practically all that is necessary to turn it into an offset 
machine. Instead of the sheet going between the lower of the two cylinders, 
that is, between the blanket and the stone, it is taken by the grippers of the 
upper cylinder and receives the ink from the rubber blanket on the lower 
cylinder, picked up by its contact with the stone. 
In offset printing, the Work or design has to be laid down on the stone 
in a different manner from ordinary lithography; because, as types or letters 
are cast in the obverse, and litho-work is transferred from the original 
writing, or written backwards on stone, by the double process it becomes 
necessary to write, or lay down the work on the stone or plate in the positive, 
just as an ordinary letter, drawing, or manuscript. The first impression oif 
the stone is on to the rubber blanket, and of course reverses the work; 
now the passing of the ink on to the paper again reverses the work, pre- 
senting it just as it was originally written. 
In transfer work it is, of course, obvious that the impression from the 
type or writing on transfer-paper reverses the subject-matter; and the 
re-transfer on to stone puts it back into the correct form for its printing 
on metal or paper. 
S0 much for the process, which I hope I have neither elaborated too 
much or failed to make clear. 
It is only a short period since rotary offset machines have been offered 
to the trade as a substitute for lithography, and this was made easy when 
zinc and aluminium plates took equal place with lithostones. The thin 


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