. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. These devices are designed to be screwed into the boiler shellat the safety line. The Figs. 78 & 79 exhibit their part to be screwed into the boiler is called the shell and iscommonly made of brass ; the internal part is plug and is madeof a soft metal like banca tin or acompound consisting of lead, tinand bismuth. This compositionmelts easily at the proper pointto allow escape, where the waterhas sunk to a dangerously lowlevel. There is considerable diversit
. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. These devices are designed to be screwed into the boiler shellat the safety line. The Figs. 78 & 79 exhibit their part to be screwed into the boiler is called the shell and iscommonly made of brass ; the internal part is plug and is madeof a soft metal like banca tin or acompound consisting of lead, tinand bismuth. This compositionmelts easily at the proper pointto allow escape, where the waterhas sunk to a dangerously lowlevel. There is considerable diversityin the make up of the materialused for filling the plug, whichmust not have its melting puintat anything less than the temper-ature of the steam lest it shouldgo ofE at the wrong Fig. 79. 172 Maxims and Instructions, yXJSIBLB SAFETY PLUG.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteamen, bookyear1917
