Hutton, Frederick Remsen, 1853-1918 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 672
h a springwhose intensity can be graduated. This avoids the bulkof the direct weight, but is open to the serious objectionthat as the valve lifts the resistance of the spring increases.The springs are also liable to corrosion, which makes them stiff.This form was used in many cases where jar from… … Fig. 494. carrying the resisting weight with a long arm, while theeffort of the valve to overcome the weight has but a shortlever-arm. This does away with the inconvenience of a greatweight, and makes adjustment of the pressure to hold thevalve shut both easy and rapid. It is probably the…
Mechanical engineering · Steam power plants
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