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Updated: May 3, 2025
In the midst of the paroxysm, he spoke, and said in a choking voice, still without looking at Gervaise, as though he was merely mentioning the thing to himself: "I'm making the herring-bone chain." Coupeau urged Gervaise to get up. She might draw nearer and see. The chainmaker consented with a grunt. He wound the wire prepared by his wife round a mandrel, a very thin steel rod.
There is a steel ring indented into the segments of Prosser's mandrel, to contract the segments when the central wedge is withdrawn. A more convenient form of the instrument, however, is obtained by placing the segments in a circular box, with one end projecting; and supporting each segment in the box by a tenon, which fits into a mortise in the cylindrical box.
The blows are then made to operate on the upper edge, detaching it from the mandrel. Careful measurements are taken of the diameter of the hoop before and after this test, and it is required that the measurement subsequent to the operation shall show that the hoop has partially, but not entirely, returned to the diameter that it had before the entrance of the mandrel.
Then he sawed gently, cutting the wire the whole length of the mandrel, each turn forming a link, which he soldered. The links were laid on a large piece of charcoal. He wetted them with a drop of borax, taken from the bottom of a broken glass beside him; and he made them red-hot at the lamp beneath the horizontal flame produced by the blow-pipe.
Spring steel, rolled with a feather edge, to facilitate its conversion into ferules, is supplied by some of the steel-makers of Sheffield, and it appears expedient to make use of steel thus prepared when steel ferules are employed. In cases where ferules are not employed, it may be advisable to set out the tube behind the tube plate by means of an expanding mandrel.
Another important change was in the nature of a reversal of the original arrangement, the cylinder or mandrel carrying the record being mounted in fixed bearings, and the recording or reproducing device being fed lengthwise, like the cutting-tool of a lathe, as the blank or record was rotated.
The general dimensions are: Distance between pillars, 6 feet; height under girder, 5 feet; height from ground to top of mandrel, 4 feet 1¾ in.; and length of stroke, 5 in. This machine is capable of delivering 500 blows per minute. The constructors are Messrs. Thwaites Brothers, Limited, Bradford, Yorkshire. By WM. L. SAUNDERS, C.E., of New York.
When the wedge is withdrawn, the segments collapse sufficiently to enable them to enter the tube, and there is an annular protuberance on the exterior circle of the segments, which protuberance, when the mandrel is put into the tube, just comes behind the inner edge of the tube plate.
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