Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 263
of the figure thatthe fire-box is double-walled, or rather walled and roofed with a layer ofwater, leaving onty the bottom vacant, which receives the grate-bars. . 582. The safety-valve is generally a conical lid fitted safety-valve. i^^o the boiler, and opening outward; it is kept down by a… … THE STEAM-ENGINE. 259 Fig. 218. How does adiminution ofwater in boil-ers often oc-casion eiplo-Bions ? it overcomes the resistance ofthe weight, lifts the valve, andallows the steam to escape.When sufficient steam hasescaped to diminish the pres-sure, the valve falls back intoits place, and the…
Physics · Science · Technology
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