"Atwood's Machine. This difficulty has however been overcome by a curious piece of machinery invented by Mr. Atwood. This consists of an upright pillar, with a wheel on the top. The weights A and B are of the same size and are made to balance each other, exactly, being connected by a thread passing over the wheel. The ring R admits the weight A, to fall through it in its passage to the stage S, on which it rests. The right and stage slide up and down, and are fastened by a thumb screw. The pillar is a graduated scale, and M is a small bent wire, weighing a quarter of an ounce, and longer than the diameter of the ring." —Comstock, 1850

Atwood's Machine

"Atwood's Machine. This difficulty has however been overcome by a curious piece of machinery invented…

"Roman Ivory Aulos found at Pompeii, showing slides and rings." — The Encyclopedia Britannica, 1910

Aulos

"Roman Ivory Aulos found at Pompeii, showing slides and rings." — The Encyclopedia Britannica,…

"Beak mouthpiece. Found at Pompeii." — The Encyclopedia Britannica, 1910

Aulos Mouthpiece

"Beak mouthpiece. Found at Pompeii." — The Encyclopedia Britannica, 1910

An illustration of a bird house with a slide front.

Bird House with Slide Front

An illustration of a bird house with a slide front.

"Sylvester's furnace doors or doors of similar form are preferable to the ordinary hinged doors, because they can be opened to any extent, and are less liable to get out of order." — Encyclopedia Britannica, 1893

Furnace Doors

"Sylvester's furnace doors or doors of similar form are preferable to the ordinary hinged doors, because…

"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

Micrometer

"A plan of this slide; the divided drum of the screw is omitted for sale of clearness. The screw S has…

"A slide-rest such as would be used with the lathe in the previous engraving, for which purpose simplicity of construction and steadiness in all its parts are the points chiefly aimed at." —The Encyclopedia Britannica, 1910

Slide-Rest

"A slide-rest such as would be used with the lathe in the previous engraving, for which purpose simplicity…

"The self-acting slide-rest carries reduction by driving the lathe itself the small "feed" movement necessary for bringing the tool to bear on successive portions of the work, it dispenses wholly with the need for physical exertion on the part of the workman, and does not even demand his continuous supervision." —The Encyclopedia Britannica, 1903

Slide-Rest

"The self-acting slide-rest carries reduction by driving the lathe itself the small "feed" movement…

"The middle one an ordinary hook tool, suited for outside work on wrought iron or steel, and the one above it a left hand tool which can be used also for inside. Their cutting edges are of course forged and ground straighter or more pointed or otherwise varied according to circumstances, and for cast iron or brass the angle of the edge is made much less acute, as in the lowest of the three in the engaving." —The Encyclopedia Britannica, 1903

Slide-Rest Tools

"The middle one an ordinary hook tool, suited for outside work on wrought iron or steel, and the one…

A player attempting to slide in to base.

Sliding

A player attempting to slide in to base.

"The Trombone is a large, deep, and loud-toned instrument of the trumpet kind, the name being an augmentative of tromba, a trumpet. It consists of two tubes, so constructed that one may slide in and out of the other, and thus form one tube that can be lengthened at will and made of varying pitch. There are three kinds of trombones, called after their compass the alto, tenor, and bass trombones."—(Charles Leonard-Stuart, 1911)

Tenor Trombone

"The Trombone is a large, deep, and loud-toned instrument of the trumpet kind, the name being an augmentative…