If the forme to be printed consists of both type and blocks mixed, a somewhat different treatment has to he employed in order to put the blocks into a relative position with the type for printing.
In his machine the stereotype plates were not made to fill the whole periphery of the forme cylinders so as to allow of the sheets being cut before printing, a difficulty w'iich the first machines did not satisfactorily overcome.
It is then brought under the second or left-hand drum, and so on to the other large impression cylinder, with the blank side of the sheet exposed to the type of the outer forme on the table underneath.
After another reading or revision in the reading closet it is sent to the compositors, who make the final corrections in the type and hand the forme to the printing department to deal with.
In rotary printing from the curved stereotype plate and from the endless web of paper much can be done to assist the printer if good stereotype plates are supplied to him, and, if the forme contains any illustrations, both the artist and the engraver can help him if they keep in mind the particular character of illustration which they are preparing for the press.
Now, supposing the forme to be dealt with consists of thirty-two pages to be printed on quad crown paper, measuring 40X30 in., on a suitable size of single cylinder machine of the Wharfedale class, it would be found, although both the machine and type were fairly new (that is, not much worn), that there was some amount of inequality in the impression given to the whole sheet.
Perfecting machines the sheet is fed directly into grippers, change taking place when grippers on each cylinder meet, the outer forme grippers taking the sheet from the inner forme grippers.
Rubini, Teoria delle forme in generale, e specialmente delle binarie (Leue, 1886); E.
See D'Arbois de Jubainville, Les Druides et les dieux celtiques a forme d'animaux (Paris, 1906), and Introduction a l'e'tude de la litterature celtique (Paris, 1883); P. W.
It may even be necessary for fine printing to repeat this a third time, especially if the forme includes blocks of any kind.