. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. The second part of the invention will be clearly understood by the an- nexed diagram and following description ; that is to say, a a shows a section of portion of a boiler, b; the safety valve attached by a rod to the lever d, and e the weights; e is a cylinder attached to the top of the boiler, having a piston/, fitting within it; this piston has a rod which passes through the end of the lever d, with a collar upon it; ji; is a syphon passing from near the top of the cylinde
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. The second part of the invention will be clearly understood by the an- nexed diagram and following description ; that is to say, a a shows a section of portion of a boiler, b; the safety valve attached by a rod to the lever d, and e the weights; e is a cylinder attached to the top of the boiler, having a piston/, fitting within it; this piston has a rod which passes through the end of the lever d, with a collar upon it; ji; is a syphon passing from near the top of the cylinder below the surface of the water in the boiler, this syphon con- tains a column of mercury equal to the required pressure of steara, the action therefore is as follows, as the pressure of steam in the boiler is increased, should the valve stick in its seat or from any other cause not be raised, the mercury contained in the syphon will be forced into the cylinder e, and a pressure of steam will then be exerted upon the piston /, and the same will be forced against the end of the lever rf, so that a pressure of steam may by this means be applied to the end of the lever d. as well as to the safety valve, â which cannot very well fail to raise it; A is a screw plug for letting the mer- cury flow from the cylinder e, back again into the syphon ; the dotted lines show that the syphon may he bent so as to come below the surface of the water, which may be employed for raising the piston instead of mercury as will be understood, for which the inventor claims, first the application of a hollow metal or other proper float in such manner as to act on the safety Talve, and aid in opening the same, when the water in the boiler falls too low ; and secondly, in the application of a syphon pipe with a column of mercury, as before deacribed, to act on the safety valve, and cause it to open the same, when the pressure becomes too great in the boiler. ATMOSPHERIC BAILWAT. JohK Aitkbn, of Surrey S
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