. Machinery and processes of the industrial arts, and apparatus of the exact sciences. gainst, the expedientnaturally employed to produce the compensation is a float. This inven-tion is not the first in which afloat has been introduced for the same pur-pose ; but it is the first inwhich the compensationwhich it was the object ofthe expedient to secure hasbeen effectually of the contrivancesinvolving the use of thefloat have in fact been asource of greater inconve-nience than that whichthey were employed toremedy. The float in thepresent instance is of asemi-cylindrical form andis
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. gainst, the expedientnaturally employed to produce the compensation is a float. This inven-tion is not the first in which afloat has been introduced for the same pur-pose ; but it is the first inwhich the compensationwhich it was the object ofthe expedient to secure hasbeen effectually of the contrivancesinvolving the use of thefloat have in fact been asource of greater inconve-nience than that whichthey were employed toremedy. The float in thepresent instance is of asemi-cylindrical form andis contained in a cylindricalchamber attached to andcommunicating with themeter. The semi-cylinderturns freely on a centralaxis, which coincides in po- Constant Level Meter. sitlOU with the SUltaCC of the invariable water level. The annexed figure illustrates the con-struction and movement here described. Immediately above the waterlevel, on one side of the chamber in its interior, is a small projecting tri-angular or wedge-shaped box, into which the gas enters by an orifice on CONSTANT LEVEL GAS METER. the under side of the wedge, just at the water level. When there is nowater at all in the meter, or very little, the float occupies naturally, bygravity, the lower half of the chamber ; but it carries on its plane sideat the extremity which is thus brought immediately beneath the gas boxjust mentioned, a stopper, which enters into the opening which is the gaspassage, closing it entirely and thus preventing further flow. If wateris now introduced into the meter, the float, by its buoyancy, will gradu-ally turn round its axis,reopening the gas passageand permitting the flow togo on again. The floatturns, because, in the po-sition in which it is ar-rested in its descent bythe contact of its stopperwith the gas box, its upperor plane surface is consid-erably inclined, owing to mm-tthe length of the greater portion of itsbulk being then on .theside of the axis opposite
Size: 1425px × 1754px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmachinery, booksubjectscientificappa
