...high-pressure boilers : it has, however, a less cohesive power, and therefore a greater thickness of metul is necessary to produce an equal strength ; but since...is not necessary to be too scrupulous in regard to tins point. Even when the metal is thin, especially if thc diamefcr is not great, the use of copper...

...and is a most excellent material for high-pressure boilers : it has, however, a less cohesive power ; and therefore a greater thickness of metal is necessary...since copper boilers never fly in pieces in case of explo1501 BOND TIMBER. BON sion, it is not necessary to be too scrupulous in regard to this point....

...sudden fracture. Copper is better than iron for this purpose, but having less cohesive power than iron, a greater thickness of metal is necessary to produce an equal strength. Copper never flies when the boiler bursts, but merely tears asunder and causes far less destruction....