Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . iler should be provided with two safety valves. Thesize of the opening into the boiler depends upon its steam pro-ducing qualities, the object to be attained being to reduce thepressure within the boiler to its safety point as quickly as pos-sible. Safety Valve is a subject, while old, is ever new to the engineer, andthe following rules are given in such a manner that any one whocan add, subtract, divide and multiply and read decimals can Haul Book of
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . iler should be provided with two safety valves. Thesize of the opening into the boiler depends upon its steam pro-ducing qualities, the object to be attained being to reduce thepressure within the boiler to its safety point as quickly as pos-sible. Safety Valve is a subject, while old, is ever new to the engineer, andthe following rules are given in such a manner that any one whocan add, subtract, divide and multiply and read decimals can Haul Book of Calculations* 241 LEVER SAFETY VALVE. soon acquire familiarity with the rules, and thus make themhis own to use when he needs them, to adjust a safety valve orfor other uses. Reference is first made to the principles, rules and examplesheretofore given relating to the lever (the safety valve is a leverof the third order) the rule of three,, and to decimals. Next, inall problems it is well for the engineer to draw, roughly, if needbe, a diagram of a safety valve somewhat after the form givenin Fig. 111. •--:.
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