breathe at the quite imperfect. The opening made by lifting thus allowed, as also through the small open- height of a man's head above the floor, there safety valves of any reasonable dimensions is ing, N, described ; but when the pressure be- is in nearly every instance a draft of cool, too small… … take place through it, while no air can be provide for the sudden generation of gases or adjusting this weight to any point desired. admitted at this point from the outside, as the super-heated steam, to which so many explo- Or, if preferred, the weight, K, may be dis- valve B is of flexible india…
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