. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . 7 rS PLATE GLASS GAUGE-COCKS AND GLASS WATER-GLASS GAUGE. 93 clogged or stopped up, can sometimes be cleaned whilethe boiler is under steam. If the lower cock should be-come clogged, close the upper cock and open the blow-offcock, if one is attached. If not, remove the bottom nuton the lower cock, which will allow boiler pressureagainst the obstruction. There being no pressure on theopposite side of the obstruction, the boiler pressure willusually blow
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . 7 rS PLATE GLASS GAUGE-COCKS AND GLASS WATER-GLASS GAUGE. 93 clogged or stopped up, can sometimes be cleaned whilethe boiler is under steam. If the lower cock should be-come clogged, close the upper cock and open the blow-offcock, if one is attached. If not, remove the bottom nuton the lower cock, which will allow boiler pressureagainst the obstruction. There being no pressure on theopposite side of the obstruction, the boiler pressure willusually blow it out. If the obstruction cannot be re-moved in this manner, it will be necessary to measurethe height of water in the boiler by the gauge-cocksduring the balance of the trip, and the obstructedgauge-cock repaired on arrival at the terminal, whereit can be bored out after steam has been blown fromthe boiler. The upper cock should be treated in thesame manner. Renewing Water-Glass. When putting in a water-glass, it is necessary to remove the gland nuts 4 and 5and the follower 9 and 10, and also all broken pieces ofglass and gas
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