disk steam engine

A form of rotary steam engine which was invented by Eric on and improved by Bishopp and others. In the Eric on engine the disk revolves, and in the Bisnopp engine the disk oscillates. disc-telegraph, disk-telegraph, s. Teleg.: One in which the letters and figures are arranged around a circular plate and are brought consecutively to an opening, or otherwise specifically indicated. The first of this cla of telegraphic apparatus seems to have been that of Ronald made in 1816. At each end of the line were clocks beating in unison; at least, such was the requirement of the invention. Each clock-work rotated a disk having the letters and numerals on a circular track, and these were exposed in consecutive order at an opening in the dial, the two ends of the line showing the same letter coincidently. The sender of a me age watched till the required letter came in view, then made an electric connection, which diverged a pair of pith balls and drew attention to the letter. This was repeated for each letter, the parties waiting till the required letter came in its turn to the openings in the respective dials. ( Knight .) disc-valve, disk-valve, s. Mach .: A valve formed by a perforated disk which nas a rotation, partial and reciprocating, or complete, upon a circular seat whose apertures form ports for steam or other fluid. disc-wheel, disk-wheel, s. Mach.: A wheel which differs from the usual worm-wheel in the mode of presenting the spiral to the cog-wheel. The spiral thread on the face of the disk drives the spur-gear, moving it the distance of one tooth at each revolution. The shafts are at right angles to each other. ( Knight .) IMG:content-0025.png:[blocks in formation]