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after undergoing a certain amount of trimming at two machines, could be taken to press and set to work within twenty-five minutes from the time at which the process began.
Besides the great advantages obtained from uniform sets of the plates, which might be printed on different machines at the rate of 50,000 impressions an hour, or such additional number as might be required, there is this other great advantage, that there is no wear and tear of type in the curved chases by obstructive friction; and that the fount, instead of wearing out in two years, might last for twenty; for the plates, after doing their work for one day, are melted down into a new impression for the next day's printing. At the same time, the original type-page, safe from injury, can be made to yield any number of copies that may be required by the exigencies of the circulation. It will be sufficiently obvious that by the multiplication of stereotype plates and printing machines, there is practically no limit to the number of copies of a newspaper that may be printed within the time which the process now usually occupies.
This new method of newspaper stereotyping was originally employed on the cylinders of the Applegath and Hoe Presses. But it is equally applicable to those of the Walter Press, a brief description of which we now subjoin. As the construction of the first steam newspaper machine was due to the enterprise of the late Mr. Walter, so the construction of this last and most improved machine is due in like manner to the enterprise of his son. The new Walter Press is not, like Applegath and Cowper's, and Hoe's, the improvement of an existing arrangement, but an almost entirely original invention.
In the Reports of the Jurors on the "Plate, Letterpress, and other modes of Printing," at the International Exhibition of 1862, the following passage occurs:--"It is incumbent on the reporters to point out that, excellent and surprising as are the results achieved by the Hoe and Applegath Machines, they cannot be considered satisfactory while those machines themselves are so liable to stoppages in working. No true mechanic can contrast the immense American ten-cylinder presses of The Times with the simple calico-printing machine, without feeling that the latter furnishes the true type to which the mechanism for newspaper printing should as much as possible approximate."
On this principle, so clearly put forward, the Inventors of the Walter Press proceeded in the contrivance of the new machine. It is true that William Nicholson, in his patent of 1790, prefigured the possibility of printing on "paper, linen, cotton, woollen, and other articles," by means of type fixed on the outer surface of a revolving cylinder; but no steps were taken to carry his views into effect. Sir Rowland Hill also, before he became connected with Post Office reform, revived the contrivance of Nicholson, and referred to it in his patent of 1835 (No. 6762); and he also proposed to use continuous rolls of paper, which Fourdrinier and Donkin had made practicable by their invention of the paper-making machine about the year 1804; but both Nicholson's and Hill's patents remained a dead letter.[2]
It may be easy to conceive a printing machine, or even to make a model of one; but to construct an actual working printing press, that must be sure and unfailing in its operations, is a matter surrounded with difficulties. At every step fresh contrivances have to be introduced; they have to be tried again and again; perhaps they are eventually thrown aside to give place to new arrangements. Thus the head of the inventor is kept in a state of constant turmoil. Sometimes the whole machine has to be remodelled from beginning to end. One step is gained by degrees, then another; and at last, after years of labour, the new invention comes before the world in the form of a practical working machine.