ated, ^^^^^^^^^^^ (having no diaphragm or man- the object is to define the na- ^^^^^^^ hole, but in all other respects ture of the causes of boiler like the patent one), it had to explosions, and to show the V&^ abandoned, one of the efficiency of the experiment- heads having cracked on er's patent… … when a last shock was given ers, thirty inches diameter by without producing an explo- Fig. l.-VIEW OF THE MUNHALL VALLEY, SHOWING THE ARRANGEMENT OF LAWSON'S EXPERIMENTAL BOILER. six feet long, the shell of two sion. The diaphragm was plates of three sixteenths inch then cut out except a margin…
