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The annexed engravings are a face view (fig. 1), and a back view (fig. 2) of the im proved chuck, invented by S. S. Hogle, and for which a patent was granted in November, 1841, but which has not been introduced into this region, and which is but very little known generally—not so much as it should be. ? ? are the jaws, they are worked by the screws, ? ?. C C are the nuts on the back side. Every opposite jaw is. secured on the same screw, and is worked by a simultaneous mo tion, except that the opposing screws on the same spindle are right and left. A is the cir cle plate of the chuck, and D are bolt openings in the back plate. The shanks of screws, ? ?, are tapered at the centre of the chuck, so that one works and rolls on the other, which allows them to cross in a very small space. It is calculated to chuck articles of a very large size and articles of only three-fourths of an inch in diameter, Jk is strong and simple, and any chips that may gather in the middle, will fall out on the back side under the screws. It is adapted for centric and eccen tric chucking. The engravings will at once show the machinist the difference between this and other chucks, and how each opposing pair of jaws can approach near to and recede from the centre as may be desired. Instead of having a screw for each jaw or sliding gripe piece, as in the old universal chuck, this one has two screw shafts, crossing one ano ther at right angles, with a right and lefthanded screw on each, so that by the turn ing of each screw shaft, two jaws are made to approach or recede from one another in their radial grooves. To increase the capaci ty of the chuck separate jaws are put on the chuck, the one fitting into the mortise of the other, and secured by screws. The assignee of the patent for this chuck, in this state, is Thomas Ashley, of Waterloo, Seneca Co., ?. ?., who manufactures the ar ticle, and from whom more information may be obtained by letter. Experiments have been lately made at Ber lin with cannon having rifle bores, and loaded at the breech with a conical missile, which is hollow, and contains powder. These experi ments are said to be very successful. With 14 pounds of powder a missile was thrown more than 6,000 feet.
