Messrs. Fourdrinier having expended 60,000 in perfecting the machine.
In the Fourdrinier process rags are ground to a pulp by a revolving beater (Fig. 125) working in a tank of water.
The Fourdrinier part consists of a head box, which resembles the case of an upright piano.
View showing the Fourdrinier part of a modern book paper-machine.
A long felt carries the paper from the couch rolls back over the Fourdrinier part, delivering it to the first press.
By 1872 two hundred and ninety-nine Fourdrinier machines were running in the United States alone.
The same principle is occasionally adopted on the Fourdrinier machine for duplex wrappers.