Mechanics' magazine and register of inventions and improvements . re left itncovered bythe water ; thereby permitting tiie heat withinthem to burn and weaken the metal of whichthey were composed—consequently, the wantof a sufliciency of water in a boiler, whetherwith or without a flue, or flues, is the cause ofa collapse. The same argument will applyto the boiler itselt, provided the fire appliedoutside rises higher than the water within ;therefore, agreeably to this reasoning, it mustbe inferred that if a boiler be proved strongenough to sustain a certain pressure, and thesatety-valve is suff
Mechanics' magazine and register of inventions and improvements . re left itncovered bythe water ; thereby permitting tiie heat withinthem to burn and weaken the metal of whichthey were composed—consequently, the wantof a sufliciency of water in a boiler, whetherwith or without a flue, or flues, is the cause ofa collapse. The same argument will applyto the boiler itselt, provided the fire appliedoutside rises higher than the water within ;therefore, agreeably to this reasoning, it mustbe inferred that if a boiler be proved strongenough to sustain a certain pressure, and thesatety-valve is sufficiently loaded within thatforce, that the only cause why a boiler shouldexplode, or a flue collapse, is from the wantof a due quantity of water in the boiler. An 154 Torreys Safety-Apparatus for Steam Boilers. Viewing the importance of the foregoingconsiderations, and the darkness now sur-rounding the subject, the following apparatushas been made and applied successfully to asteam boiler in a steamboat: r from the application of it,ing remarks will amply de-. References.—A A, a cylindrical boiler?and r r, the water line inside of it; B, a glo-bular float, intended to move perpendicularly—for which purpose it has two or more rings,b b, affixed to it, through which tlie rods c cpass, being made fast at their ends at the topand bottom of the boiler ; D, a straight rod,or piston, the lower end of which is attachedto the float B, and the upper, after passingthrough the stuffing box, E, on the top of theboiler, is fastened to one end of the chain f,which passes over the wheel G—on the otherend is hung the weight H ; I, is an alarmbell, and k, the tongue or hammer which ringsthe alarm ; L, a wheel which communicateswith the hammer k, and over which the chainm is placed, to which the weight 7i ishung ; O, a ketch communicating with the topof the rod D, by the cord p. Of the fact that this apparatus will give thetrue height of the water in any boiler, andthereby give sure warni
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