Engineering Improvements. DIFFERENTIAL PRESSURE GAGECHARLES B. tion is to provide a pressure-indicator for engines cylin ders pumps by means of which it is possible accurately to determine the pressure at both ends of the cylinder or in the two pump-chambers so that in case of variation of ' pressure existing errors can be rectified by making nec essary adjustments in the valves. The indicator com prises a tube adapted to be connected at its ends with different pressure supplies. Pistons are fitted to slide in the tube and are spring-pressed toward the ends of the tube. A pointer indicates the variation of pressure against each piston. in which the grate comprises an endless conveyer mounted to travel in the fire-box so as to carry the fuel uniformly to the point of combustion. The invention is primarly concerned with the provision of a chain con veyer. A pair of rods oblong in cross-section are loosely mounted in the chain. The horizontal forks of the grate-bars are mounted on the rods the bars being arranged back to back to prevent their displacement when in position. A coupling-link connects the rods to hold them from independent movement. Mechanical Devices. to this inventor for a novel type-writer. In both machines the same result is attained with somewhat different means. With only five keys he obtains all the charac ters usually employed in writing so that the machine can be readily operated with one hand. The number of com binations obtainable with these five keys is thirty-one. Two auxiliary keys are employed by means of which thirty-one additional characters can be obtained twice over so that the total number of possible characters is ninety-three. The spacing of the type is automatically measured so as to correspond with each letter to be printed enabling the form and size of the type to be varied at will. With the same machine large and small leders of English scrpt printing-letters German Greek and Russian characters can be used. The writing is al ways
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