. Model engine construction, with practical instructions to artificers and amateurs. Fig. 12. lever is pulled down by a Salters spring-balance,which is generally graduated. The balance can be 56 MODEL ENGINE CONSTRUCTION. made with a small spring acting against a piston,moving up and down in a small tube, closed at bothends. The piston-rod passes vertically through ahole drilled in the end of the safety-valve lever, andat its upper end is screwed, and provided with anut. The valve is held down against the steampressure by means of the spring in the tube, pullingthe lever downwards. The nut can
. Model engine construction, with practical instructions to artificers and amateurs. Fig. 12. lever is pulled down by a Salters spring-balance,which is generally graduated. The balance can be 56 MODEL ENGINE CONSTRUCTION. made with a small spring acting against a piston,moving up and down in a small tube, closed at bothends. The piston-rod passes vertically through ahole drilled in the end of the safety-valve lever, andat its upper end is screwed, and provided with anut. The valve is held down against the steampressure by means of the spring in the tube, pullingthe lever downwards. The nut can be slackened, or. Fig. 13. tightened up, as required to suit the steam spring-balance at its lower end is pivoted toa bracket, which is soldered or screwed into theboiler. A direct-acting spring-valve (see Fig. 13) is a goodone for small models. This can be easily made fromthe instructions given, or it may be purchased, ofany suitable size, from the model-makers.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmachinery, bookyear18
