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"I expect you know what that is! The Lewis smashed when the frame came down." "It's the wedge. Don't see why it broke; plenty metal left, though the slot weakened it." "What's it made of?" "Steel. The iron I wanted didn't come; but this is mild, low-carbon stuff." "Then what's the matter with it. It did break." The smith put the piece into a socket in the anvil and struck it with a hammer.
The proportion is as 1 in the case of semi-hardened steel or chilled iron to 100 in the case of very soft, low-carbon steel. The proportion is as 1 in tools made from tempered carbon steel to 7 in the best high-speed tools. The proportion is as 1 with thickness of shaving 3/16 of an inch to 3 1/2 with thickness of shaving 1/64 of an inch.
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.
Each of the twelve following variables has an important effect upon the answer. The figures which are given with each of the variables represent the effect of this element upon the cutting speed. "The proportion is as I in the case of semi-hardened steel or chilled iron to 100 in the case of a very soft, low-carbon steel."
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