. Transactions . « a> 7. ^rS â p a) 2~o,2 I r- O So £c Z z o o be-11 I £ â t-< ? S3 £ fl cc u UlQ â g CJ D £Q «IP * -S 3 -â¢Â£,=: - CC feOO^? u Ll. feOWW^ CO o ^ H < oc .= £sooâ¢- _- H M O 730 DETERMINING THE HEATING POWER OF DIFFERENT FUELS. then down through a fire-brick connection into the tubes in the lowerheater, after leaving which they pass into the chimney. Air is fedto the fire, under the grate-bars, through a pipe leading from a fan-blower. The air is measured by recording the revolutions of theblower, and the measurement is checked by an anemometer in theair-pipe. It
. Transactions . « a> 7. ^rS â p a) 2~o,2 I r- O So £c Z z o o be-11 I £ â t-< ? S3 £ fl cc u UlQ â g CJ D £Q «IP * -S 3 -â¢Â£,=: - CC feOO^? u Ll. feOWW^ CO o ^ H < oc .= £sooâ¢- _- H M O 730 DETERMINING THE HEATING POWER OF DIFFERENT FUELS. then down through a fire-brick connection into the tubes in the lowerheater, after leaving which they pass into the chimney. Air is fedto the fire, under the grate-bars, through a pipe leading from a fan-blower. The air is measured by recording the revolutions of theblower, and the measurement is checked by an anemometer in theair-pipe. Its weight should be calculated from the barometricpressure, and its contained moisture should also be determined. Itstemperature should be taken before it enters the ash-pit. The tem-perature of the escaping gases should be taken by several thermo-meters, the bulbs of which reach to different portions of the chimney Fig. Section a a connection. Cold water is supplied to the bottom of the lowerheater, at the chimney end, its temperature being taken before itenters, by a thermometer inserted in the pipe. The water supply-pipe may conveniently be attached to the city main. The waterpasses through the two heaters in an opposite direction to that of thegases of combustion, and escapes at the outlet-pipe at the top of theupper heater, by which it is taken to two measuring tanks, which arealternately filled and emptied. The temperature of the outflowingwater is taken by a thermometer inserted in the outflow-pipe. Therate of flow of water through the apparatus is regulated, so that thetemperature of the outflowing water does not exceed 200° F. Themeasuring-tanks have closed tops, which prevent evaporation, smalloutlet-pipes being attached to the top of each which serve both as THE PROCESS USED FOR REFINING COPPERY BULLION. 731 indicators when the tanks are full, and to allow air to escape fromthe tank when i
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
