. The street railway review . ned and well regulated fur-naces and boilers, especially wheu the tiring is dme by fed boiler furnaces usually givi- the iimsl ero-noniical results. The actual value of the fuel dipeiuls uponthe way in whii h it is used fully as much as on any other heat unit in the coal should be as inuch as possible one pound of good steam coal there are about 14,0 K) H. T. I.,and about of this amount can !»■ uiili/.cd. so that 4,i«ibheat units are lost. The of gases in a furnace depends on the amount ofair used. One poun
. The street railway review . ned and well regulated fur-naces and boilers, especially wheu the tiring is dme by fed boiler furnaces usually givi- the iimsl ero-noniical results. The actual value of the fuel dipeiuls uponthe way in whii h it is used fully as much as on any other heat unit in the coal should be as inuch as possible one pound of good steam coal there are about 14,0 K) H. T. I.,and about of this amount can !»■ uiili/.cd. so that 4,i«ibheat units are lost. The of gases in a furnace depends on the amount ofair used. One pound of coal requires, theoretically, about 12lbs. of air to burn completely, but in practice about twice thisamount is required in the boiler furnace. To cans: good com-bustion, coal requires a good draft; the gases are consumed marthe fire and the waste gases carry the heat to the boiler on theirway to the stack. The boiler ought to have sullicient heatingsurface, or the hot wasteii gases ought to travel a suflicieiit dis-. OVER 8 TONS OF SCALE FROM FIVE BOILERS. These Ixiilers are of two well-know n nuiUcs, three of one kindrated at 300 h. p. each and two of another rated at 375 h. p. each. The scale was removed by the Cliicago turbine cleaner whichis shown in the smaller engravings; the tool comprises a waterturbine enclosed in a case aliout 2% in. in diameter and 3 in. long;to the turbine shaft is connected the cleaner proper by means ofa universal joint so that the tool may be passtd tlirongh curvedtubes equally as well as through straight ones. The cutting toolsare toothed wheels such as are used for dressing emery are mounted on four arms about 5 in. in lenglh, hinged to acentral shaft. Water is supplied through a wire-wrapped hose ata pressure as near 100 lbs. per sq. in. as the source of suppy per-mits. The principle is easily understood; the turbine revolves ata speed of from to r. p. according to the pressure;and the arms are thrown out b
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
