The Artisan, or, Mechanic's instructor : containing a popular, comprehensive and systematic view of the following sciences ... also biographical notices of eminent scientific men, enriched by portraits : with many interesting and valuable articles relating to the mechanical and useful arts : the whole intended as a companion to the institutes (1825)
Carey, George G · London : Printed for William Cole · leaf 377
f machinery The annexed figure represents an in- on land. accessible safety-valve, calculated to an- The safety-valve being therefore an swer all the purposes for which it is in- object of considerable importance, both as tended ; namely, the preservation of those regards the utility of the engine,… … In this, as in the preceding diagram, A represents the boiler, and B the safety- valve, furnished with a small upright staff, on which slide the additional weights C C C. The whole is inclosed in a box D, pierced with holes to allow the steam to escape, fcafter it has raised the valve B . A, the…
