The Practical mechanic's journal . Leyden jar. A glass pillar, c, is loosely fixed in the bottom board of the apparatus, so as to be capable of motion on its axis. The glass pil-lar carries on its upper extremity a crooked wire and ball, and a chainconnects the ball and nob of the jar. When the jar is charged, the glasspillar is moved round, until the ball it carries is above the one on thegable, when a discharge will take place, and the spark, in its passage,will throw the wire in the hole, b, from its place, producing an imitationof a stroke of lightning on a small scale. NEW FEED APPARATUS
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The Practical mechanic's journal . Leyden jar. A glass pillar, c, is loosely fixed in the bottom board of the apparatus, so as to be capable of motion on its axis. The glass pil-lar carries on its upper extremity a crooked wire and ball, and a chainconnects the ball and nob of the jar. When the jar is charged, the glasspillar is moved round, until the ball it carries is above the one on thegable, when a discharge will take place, and the spark, in its passage, will throw the wire in the hole, b, from its place, producing an imitationof a stroke of lightning on a small scale. NEW FEED APPARATUS FOR STEAM BOILERS. The burning and exploding of boilers is of sufficiently alarming extent, to call for all our ingenuity to amend the evil, and may afford me anexcuse for troubling you with the accompanying sketch of a new self-acting feed apparatus, as a movement in the direction of greater securityto steam-boat and locomotive-carried travellers, as well as the moredirectly engaged operatives connected with propelling machinery.. The view I enclose, is a vertical section of a portion of a boiler andfeed valve, float, &c. a, Is the valve-chest, with its inlet or receivingbranch, b, and outlet or discharging branch, e; d d, are two conicalvalves fast on the spindle of the float, e, which is a hollow copper ball;The seats of these valves are set in opposite directions, the upper onebeing for the overflow, and the lower one for feeding. As the valves aredrawn, the boiler is supposed to be in the act of receiving its feed, through the lower valve, the actual level of the water being at/. Theproper working level is represented by the sharp line above; when theball-float arrives at this point, the lower valve will be closed, and theupper one opened simultaneously, so as to permit the feed-water to passaway. As the pressure of the water is equal on each valve, that of thesteam only requires to be counterbalanced, which is done by weights onthe upper end of the spindle. I have represent