. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 243. FLEXIBLE BALL JOINT. The space between the ball and shell is filled withan elastic lubricated packing held in place byan annular follower and springs. 244. BALANCED EXPANSION JOINT for steam pipesSmith pat. Referring to the cut, it will be noticed that the inner

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. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. 243. FLEXIBLE BALL JOINT. The space between the ball and shell is filled withan elastic lubricated packing held in place byan annular follower and springs. 244. BALANCED EXPANSION JOINT for steam pipesSmith pat. Referring to the cut, it will be noticed that the inner tube has an increased diameteror ring about halfwayalong its length. Thisforms a shoulder or pistonat the end next to the bot-tom of the large stuffingbox casting. The otherend of this annular pistonor ring is open and is steadied by the gland. In the inner tube belowthis ring there are holes which admit steam from the main, back of the

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