THE PRINTING PRESS. 



inking-rollers act by gravity ; also any dust shaken out of the 

 paper, which formerly was deposited upon the inking-rollers, now 

 falls upon the floor. 



With this machine 50000 impressions have been taken without 

 stopping to brush the form or table. 



26. Marinoni's Newspaper Printing-press. Messrs. Marinoni 

 and Co., of Paris, have, within the last few years, constructed 

 improved printing presses for newspapers of large circulation, 

 several of which have been erected and brought into operation in 

 the printing-office of the Paris journal La Presse. This printing- 

 machine, which is capable of working off 6000 copies per hour, 

 printed on both sides of the paper, is represented in fig. 11. It 

 will be perceived that eight men are employed in the process, four 

 layers-on and four takers-off. The machine is double, the parts 

 at each side of a vertical line drawn through the axis of the fly- 

 wheel being perfectly similar. The manner in* which the sheets 

 pass to and from the printing-rollers will be more readily under- 

 stood by fig. 12, where A is the upper and A' the lower delivering- 

 board, and B the upper and B' the lower receiving-board on the 

 right, the two delivering and receiving-boards on the left being 

 similarly placed. The motion of the sheets, as they are conducted 

 to and from the rollers by the tapes, is indicated by arrows, and 

 the course followed by each sheet from the moment it leaves the 

 delivering-board until it arrives at the receiving-board, is indi- 

 cated by the numbers 1, 2, 3, 4, &c. Thus, the sheet delivered 

 from the board A is taken by the tapes which pass round the 

 roller M, and carried from 1 to 2. Arriving at the lower roller, it 

 passes, as shown by the arrow, between the rollers, 3, and is 

 carried from 4 under the printing-roller I, where it is printed on 

 one side, after which it is carried up between the tapes to 5, from 

 whence it is discharged between the tapes of 6, and carried up 

 over the roller B, at 7, from which it is carried down between the 

 tapes 8, and thrown, as shown by the arrow, to the tapes 9, by 

 which it is again carried under the roller and printed on the other 

 side ; after which it is carried up successively between the tapes 

 10 and 11 to 12, and finally discharged from 13 at 14 upon the 

 receiving-board B. 



The sheet delivered from the lower receiving-board A', follows 

 a course precisely similar, entering at 1' and passing round the 

 printing-roller at 2' 3', from which it passes between the tapes 4' 

 round the roller n' at 5' 6', and thence from the tapes 1' 8' round 

 the printing-roller i' at 9', by which it is printed on the other 

 side ; after which it is carried by 10', 1 1', 12' to the lower receiving- 

 board B' at 13'. 



The inking-rollers are shown at E P D and D', and are arranged 

 24 



