Micrometer

“A plan of this slide; the divided drum of the screw is omitted for sale of clearness. The screw S has a shoulder at k, carefully fitted and ground to a bearing so as to work sweetly in a hole in the very strong spring o o; the other extremity of the screw is formed into a pivot, which fits a hole in the brass piece B B. The end of this pivot—hrdened, polished, and slightly rounded—rests on the flat surface of an agate a, which is imbedded in the end of the slide, and kept firmly in its place by the brass piece B B.” —The Encyclopedia Britannica, 1903

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