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A most valuable invention of the deceased officer was the cut-down screw bolt for securing armor plates to ships and ports. It was at one time feared that no fastening could be got for armor plates, as on the impact of a shot the heads or the nuts always flew off the bolts. The fracture usually took place just at the point where the screw-thread terminated.
When the bar was crossed and the ship fairly in blue water, work began. Rudyard Kipling has a characteristic story, "How the Ship Found Herself," telling how each bolt and plate, each nut, screw-thread, brace, and rivet in one of those iron tanks we now call ships adjusts itself to its work on the first voyage.
By pressure the fluids are mixed and the pores are closed. A stuffing box filled with this mixture has worked three years without grinding the piston-rod. In the same manner I close the screw-thread hole in gas tubes used for conducting steam. When the tube is screwed in the socket, the powder mixes with the oleic acid. The water coming in at first makes the linseed powder viscid.
The mounting of the crank boss on the shaft and the insertion of the crank pin into the boss might well be entrusted to an expert mechanic, as absolute "squareness" is essential for satisfactory working. Screw-thread attachments should be used, and the crankshaft should project sufficiently to allow room for a flat lock nut.
O'brien went nimbly down the ladder, placing one of his own sturdy shoulders under the forward end of the pipe, while Benson got back with Hal Hastings at the other end. In about three-quarters of an hour the trio were back, with the pipe cut to the right length, and with a new screw-thread cut at the shortened end. "Now, you can demonstrate your own work, Benson," laughed Mr. Farnum.
In the tool holder of the lathe was clamped a chip of some hard mineral that did a good enough job of cutting the forged iron and low-carbon steel. Even more cheering was the screw-thread advance on the cutting head that was used to produce the massive nuts and bolts that secured the caroj wheels to their shafts. It could have been worse.
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