mxum. June 9, 1877.] 353 2. Disk safety valves, in which a disk is secured to the valve is one which will rise as soon as the pressure at which It will be observed that some of the special forms of it is set is attained, will prevent the pressure increasing if valve having a greater area than the… … 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- periments with these ordinary safety valves enabled the Com-…
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