Scientific American. JUNE 9, 1877.] 353 valve is one which will rise as soon as the pressure at which 2. Disk safety valves, in which a disk is secured to the It will be observed that some of the special forms of it is set is attained, will prevent the pressure increasing if common valves, allowed… … more. This is probably due to the fact that the very form ly increased area when opened, as these features are very meritorious, at least in a theoretical point of view. The ex- by which the greater lift was obtained made it more diffi- SS periments with these ordinary safety valves enabled the…
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