The Oracle Encyclopaedia Volume 5; Profusely Illus., Containing the Most Accurate Information in the Most Readable Form

 
9781235963834: The Oracle Encyclopaedia Volume 5; Profusely Illus., Containing the Most Accurate Information in the Most Readable Form

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ... having usually a reciprocating motion and iron blades like the ordinary hand stone-saw. For cutting the slabs of marble into strips, a machine, consisting of a gang of circular iron disks mounted on a horizontal spindle, which is rotated by a band and pulley, is in general use. The slab is mounted on a travelling carriage which presses the stone against the disks, while sand and water arc profusely applied to the kerbs or slits so made. Mouldings are imparted to edges of marble strips intended for mantelpieces and other objects, by means of a solid iron cutter, having a converse form to that of the moulding to be produced. The cutter revolves rapidly on a vertical axle, and the marble, resting on the bed of the machine, is brought up against it, and carried onward as fast as the moulding is produced. Marble is also cut into balusters and other architectural ornaments on a lathe with steel tools, the marks of which are afterwards removed by grinding. Stone-working machines, in which boart or black diamond constitutes the cutting agent, are being widely introduced in the United States. In the diamond stone-saws every tooth is tipped with a diamond, much ingenuity being displayed in the fixing of it to a thin metal body. The circular form is chiefly adopted, the diameter being about 6 feet, and the disk revolves at a high velocity, while the slit is deluged with water. Machines for dressing or facing building-stones have been contrived on different principles. Stone-Fly, a species of Neuropterous insects familiar to anglers, and much used as a bait in trout-fishing. The hinder wings are large, and the abdomen has two long filaments. The larger jaws or mandibles are rudimentary. The S. and its larvae are common in ponds. Stone-Fruits is popularly applied to th...

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