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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
eel is called shrouding. Breast-wheel steam-en′gine. A form of rotary steam-engine in which a jet of steam is made to impinge upon the floats of a wheel rotating in an airtight case. The first steam-engine of this class was one of the earliest on record. Brancas, A. D. 1520, had a copper boiler and eduction-pipe, the steam issuing from which rotated the vanes of a shaft, which (on dit) worked pestles for grinding materials, raising water by buckets, sawing timber, etc. Corder and Locke's rotary steam-engine. corder and Locke's breast-wheel engine is one form of the rotary steam-engine, having neither piston nor valves. It consists of a wheel rotating in an air-tight case, receiving a jet of steam introduced in a tangential direction, the case having free communication with a condenser. The action upon the wheel is analogous to that of water upon a breast-wheel, the steam impinging with a force determined by its pressure and with an effect proportionate to the size of
Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
astronomical, and other observations, it is also employed to secure isochronous beats of distant pendulums. A mode of keeping distant chronometers in exact simultaneous pulsation by which longitude may be exactly determined; the invention of Dr. John Locke of Cincinnati. E-lec′tric Pi-a′no. One provided with a series of electro-magnets, each corresponding to a key of the instrument, the armatures of which are caused to strike the keys when the circuit is closed. This may be effected byion-work of a clock. By this means isochronous pulsations of seconds are maintained at all the points connected with the regulator, and thus perfect uniformity is established at all the clocks of a city, capitol, or private establishment. Dr. Locke of Cincinnati, about 1848, invented the method of obtaining isochronous vibration of pendulums by electric connection. Congress awarded him a premium of $10,000 for the invention, designing to use it in astronomical researches and determining
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
in size. Dissolving views are produced by the employment of two lanterns of equal size and power, so arranged that the circle of light transmitted from each shall fall upon the same part of the screen. A perforated plate with a crescent-shaped opening is adjusted so that as light is admitted to the slider of one lantern it is shut off from the other, the first picture disappearing as the second becomes illuminated. See dissolving view. Phan′ta-scope. An instrument invented by Dr. John Locke of Cincinnati, to illustrate some phenomena of binocular vision. It consists of a flat board with an upright rod at one end, with two adjustable thimbles, like those of a retort-stand. The upper one supports a card with a slit 3 inches long and 1/4 inch wide, so as to admit both eyes to look through it. The other thimble supports a second card with a slit, and an index marked across its middle. By an adjustment of the second card, a pair of objects on the base-board is viewed through
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
large American cities, is referred to on page 849, and the devices on page 1913, register; page 1918, repeater. One important application of the telegraph is for determining differences of longitude. For this science is largely indebted to Dr. Locke, of Cincinnati, by whom it was successfully practiced as far back as 1848. Cambridge Observatory, Mass., has thus been brought into direct communication with San Francisco by connecting the wire with the pendulum of a clock at Cambridge, so thhe four-way cock is an invention of James Watt. See Fig. 2091, page 912. Haskell's three-cylinder pump. Three-way valve. One which governs three openings, as a three-way cock (which see). Three-headed rail. Fig. 6418 is a view of Locke's three-way balanced valve for hydraulic elevators. 1 shows it supplying water; 2, closed; 3, slowly discharging; corresponding to, 1, lifting the cage; 2, holding the cage stationary; 3, allowing the cage to descend gradually. The indented pos