Improved Straw Cutter

1852 Scientific American  
has taken measures to secure a patent for II,n improved steam bOiler. The chief object of ,this invention is to provide a means of reliev ing the , boiler of dangerous pressure without a great loss of steam and without materially or even at all interrupting its proper opera. tion. This is effected by placing on the top of the boiler a cylindrical vessel which the inventor terms a safety-chamber. The said vessel is separated from comm�nication with the steam in the boiler by a metal plate (cop
more » ... r is preferable) which is sufficiently strong to bear the pressure of the steam up to the maximum that may be desired. But if the steam should exceed that pressure it will cause the plate to tear asunder and the steam will rush into the safety chamber, when the pressure will be at once reduced; and as the inventor propof\es to make this eham ber with a capacity equal to the amount of steam space in the boiler, the pressure of the steam will be reduced one half . From the fact that the water would be likely to foam up into the safety-chamber as the steam rushes in, ano ther plate of the same strength as the boiler is connected to the before-mentioned satety plate, the only way by which the steam can pass from the boiler to the under side of the latter being through a small' pipe provided with a faucet. Supposing that the steam has rent the safety plate and rushed into the cham ber, it then sounds a whistle, which inf orms the engineer of the occurrence:' the pressure being by this time reduced, he closes the com· munication between the boiler and chamber, allows the steam in the latter to escape, and replaces the torn safety. plate by a new one, for which pUf]�ose he is always provided with two or three spare plates. New Cu�,olf Gear. Measures to secure a patent tor an improved Cut·off for locomotives have been taken by J. E. Wootten, of Pottsville, Pa. This plan of giving a variable movement to the Vlilve is intended by the inventor to be applied to lo comotives and stationary. engines. On the 'rock-shl\ft are placed two vertical arms, hav ing on them a sliding block formed in two parts and connected by a pin. This block is moved to any desired position along the arms by a scrllw, which is turned by the engineer with the aid of a ball and socket· joint and two bevel wheels operated by a long shaft. A frame is attached to the valve-rod in which fit two boxes, w4ich also connect with the block-pin. It is evident that the valve ,j;ra vds more or less according to the aajustment 01 the block, which is not only moved as requi red by the screw, but is by the same means retained in a firm positior.. It has been said that a ball and socket· joint are used in the ope· ration of adjusting, but it is apparent that it would not act in the manner proposed were it not for two small projections formed on the ball, and which fit into corrt1sponding recesses in the socket. == Rotary Engine» Wm. Taylor, of Schenectady, N. Y., has ta ken measures to secure' a patent for an impro ved Rotary Engine. The arrangement of this engine is as follows: a shafp is placed central ly in a fixed cylinder, and around the hub of this shaf t are placed the pistons which are pressed against the inner periphery of a circu lar collar attached to the cylinder. ' Through this collar are cut the steam ports or openings, which are as wide as the space between the sides of the pistons. When, theref ore, the steam issues through these ports, it im pels the pistons, which revoh e within the collar, and carry . the shaft round in their rotation. The mode of applying the steam is likewise pecu· liar. Between the outer surface of the collar and the inner surface of the cylinder, is aspace which the inventor terms a steam chest, there is a stop placed in it to compel the steam to take the right 'direction. At each end of the cylinder is a head, which bears steam.tight
doi:10.1038/scientificamerican12181852-108d fatcat:nzdoljtr3bfnfdnt2baplxv23a