. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ion, and the outside turncLl to a perfect fit to the cylinder. After this, the pin-holes inthe rings are filled to admit of the rings being compressed, while not allowed to a part of the thickness of the piston is used to secure it to the rod, this being done togive additional length to the piston-rod bush. The castings are very thin and light, and arethoroughly ribbed for strength. The only part that ca
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ion, and the outside turncLl to a perfect fit to the cylinder. After this, the pin-holes inthe rings are filled to admit of the rings being compressed, while not allowed to a part of the thickness of the piston is used to secure it to the rod, this being done togive additional length to the piston-rod bush. The castings are very thin and light, and arethoroughly ribbed for strength. The only part that can wear is the bull-ring, which is packeddown to keep the piston in the center of the cylinder by liners made of narrow strips ofsheet metal. Flanges cast on the spider and follower inside of the piston-rings make them sostiff that only four studs are used. The pistons are secured to the rods by two taper fits, aparallel thread, and shrink fit. The piston packings are simply Babbitt-metal bushings, with reamed holes slightly largerthan the rods, so as to be a free sliding fit. One form is shown in Fig. 14. They rest inspherical seats, which are free to move in any Fig. 12.—Sweets straight-line engine. The cross-head is shown in Fig. 15. It is of steel or malleable iron casting, and is threadedon the piston-rod and secured bv being split and clamped by the binding-bolts. The cross-head pin is a hollow steel castingmade fast to the connecting-rod, and turns in two adjustableBabbitt-lined boxes in the cross-head. The object of this is to secure lightness, extra wearingsurface, to prevent side swinging of the connecting-rod at the fly-wheel end, and to giveready means of oiling. The cross-head is what is known as the slipper-guide sort, the lowerguide being adjustable in the vertical direction. It rests upon and is bolted upon two mclinedplanes, and may be readily raised or lowered to bring the piston-rod in perfect alignment. 304 ENGINES, STEAM, STATIONARY KECIPROCATI
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