, and so causing stoppages; or
they may be merely harmful economically by acting as diluents to the
acetylene and, by having little or no illuminating value of themselves,
causing the gas to emit less light than it should per unit of volume
consumed, more particularly, of course, when the acetylene is not burnt
under the mantle. Also, not being acetylene, or isomeric therewith, they
require, even if they are combustible, a different proportion of oxygen
for their perfect combustion; and a good acetylene jet is only calculated
to attract precisely that quantity of air to the flame which a gas having
the constitution C_2H_2 demands. It will be apparent without argument
that a proper system of purification is one that is competent to remove
the carbide impurities from acetylene, so far as that removal is
desirable or necessary; it should not be called upon to extract the
generator impurities, because the proper way of dealing with them is, to
the utmost possible extent, to prevent their formation. The sole
exception to this rule is that of water-vapour, which invariably
accompanies the best acetylene, and must be partially removed as soon as
convenient.
Pages:
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315