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TABLE- (Continued)

OF SQUARES, CUBES, AND SQUARE AND CUBE ROOTS, ETC.

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TABLE-(Continued)

OF SQUARES, CUBES, AND SQUARE AND CUBE ROOTS, ETC.

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TABLE- (Concluded)

OF SQUARES, CUBES, AND SQUARE AND CUBE ROOTS, ETC.

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Any number multiplied into itself 3 times is cubed; as, 3×3×3 27, which is the cube of 3.

The square root of any number is that number which, multiplied into itself, will be equal to the given number; as, √9=3×3; hence 3 is the square root of 9.

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The Wetherill Corliss Steam-Engine.

The cut on opposite page gives an outline of the general appearance of the Corliss Engine as built by Robert Wetherill & Co., Chester.

The Main Bed is shaped in the strongest form and in direct centre line connecting up cylinder and pedestals. The main pedestal bearings are made in four parts, adjustable. All bearings and wearing surfaces are arranged to take up lost motion occasioned by wear. The proportions, weights, and strength of material are ample. Cylinders are made of hard, strong, charcoal iron, and have all large proportioned port openings, which gives the full boiler pressure against the piston. The cross-head is of an improved pattern, which takes a direct bearing between centre of shoes, and the shoes are gibbed in such a manner that they can be easily removed or any lost motion taken up. Shafts, connectingrods, and all forgings are made of double-worked hammered iron. Piston-rods, crank-pins, and all other small pins and valvemotion forgings, are of steel. Valve-stems, crank-pin boxes, and valve-gear brasses are all of bronze metal.

The Governor is of the regular Corliss pattern with improvements, but does not require the oil or molasses pot generally used. It acts free under varying loads and pressures, and regulates closely from one horse-power up to the full capacity of engine.

Piston is self-packing, and does not require any attention from the engineer. It keeps the cylinder in good order, requires very little lubrication, and has a reputation of running eight years night and day without any attention, keeping in good order and steam-tight.

Vacuum Dash-Pots for closing valves are generally used. On slow running engines, weights closed with air-cushion are preferred.

Graduating Oil-Cups on all wearing surfaces, and self-feeding oil-cups for cylinders.

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