. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. VEETICAL SECTION. FIG 3 The use of the valve K, communicating with the outside of the cylinder is that, in case of a leakage of air behind the piston, it shall be driven by the return of the piston tlu-ough it to the outside. The use of the exhausted chamber and valve l, communicating with it is, that a small portion of the leakage air or oil w hich cannot be dis- charged through the valve k, leading outwards, escapes into the exhausted chamber, which allows the piston to get
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. VEETICAL SECTION. FIG 3 The use of the valve K, communicating with the outside of the cylinder is that, in case of a leakage of air behind the piston, it shall be driven by the return of the piston tlu-ough it to the outside. The use of the exhausted chamber and valve l, communicating with it is, that a small portion of the leakage air or oil w hich cannot be dis- charged through the valve k, leading outwards, escapes into the exhausted chamber, which allows the piston to get to the bottom, and to bring the teeth of the rack in hard contact with the teeth of the wheel, and thereby keep the door in its proper jilace when shut; in fact, gives it a maintaining power. The regulator is for tempering the speed of the door when shutting. It consists of a snuiU cylinder <i, with a piston T, made to fit tightly into it by hem]) packing; in the. VERTICAL TRANSVERSE SECTION piston T, is a conical valve v, opening inwards to charge the cylin- der w ith oil when opening the door. This valve closes wheii the door begins to shut. At the end of the cylinder q, is another valve, or what is commonly called a cock, which regulates the discharge of the oil which passed into the cylinder during the opening of the door. According to the size of the aperture z, in the cock, so is the time it takes to discharge the oil. and so is the speed of the door in resuming its position when shut, which com- pletely prevents the motion increasing beyond what is wanted and avoids slamming. The box requires to be filled with lard or sperm oil up to the dotted line o, to seal the piston and keep the whole lubricated. These hinges have been used for some of the public establish- ments in Edinburgh with success. ELASTICITY OP CAST-IBON. The Ili/prrliolic Law of Elasticity of Cast-iron. By Homebsham Cox, Jesus College, Cambridge. The object of this paper was to show that the exten
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