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Third Part.



86. An Englishman by the name of Tulloch took out a patent of invention in 1826 for a machine for sawing stone and Marble, and which was also suited to the execution of moldings. The following description is given of it:

The principles of this invention consist-

First. That the movable frames which hold the saws or molding tools employed for sawing or cutting different moldings in Marble or in any other kind of stone, descend in proportion as the saws or tools move, in such a manner that these frames will have a constant movement which will advance or retreat in a horizontal direction, and parallel, or nearly so, with the blocks of the saws or tools, and that, furthermore, if the block of Marble or stone is softer on one side than the other, the sawing or molding resulting from the action of the saws or tools, will not advance more rapidly on the softer than on the harder side.

Secondly. That during the operation of sawing, the end of the saw frames rise a little near the end of each alternate movement in which they advance or recede in such a manner that, at the end of each movement, all the saws fixed in the frames are alternately slightly raised to permit the sand and water which are usually employed in sawing of Marble, to pass freely between the grooving of the stone and the cutting pressure of the saw: this is impossible if the saws are not mounted to rise in this manner.

87. Another French mechanician has proposed the following method of sawing stone and Marble, which he thus describes:

"I first place the Marbles and stones which are to be sawed, upon the same plane, in such a manner that every stroke of the saw may move in the same line.

"I use common saws, the handles of which are united and joined together in such a manner that the set may form a single, many-bladed saw.

"My large pulley, vertically placed, and furnished with a crank, draws, with the aid of a movable bar, the set of saws, which is carried back to its point of departure by the bar, or by a weight suspended to a chain passing over this pulley, and attached to the last of the saws.

"To prevent the set of saws from turning aside at the commencement of the work, it will be necessary to guide it with the hand until the strokes of the saw may be formed.

"Thirty or forty saws can thus be moved with a small power, and two men will be enough to moisten them, and to set the machine in motion in case of its stoppage.

"General Application-The natural effect of my double apparatus is, to give to a roller or rotatory movement in different directions; but as known mechanical means exist of converting one kind of a movement into another and different kind, it follows, therefore, that my machine is, in truth, a universal moving power, which can replace every known force in the different needs of arts. This substitution will be always advantageous, since the force of the new moving power is enormous, and its establishment less expensive than that of any other moving power of an equal force."

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