, is specially valuable, more particularly if the
ordinary cylinder of lime is replaced by one of magnesia, zirconia, or
other highly refractory oxide.
CHAPTER XIII
PORTABLE ACETYLENE LAMPS AND PLANT
It will be apparent from what has been said in past chapters that the
construction of a satisfactory generator for portable purposes must be a
problem of considerable complexity. A fixed acetylene installation tends
to work the more smoothly, and the gas evolved therefrom to burn the more
pleasantly, the more technically perfect the various subsidiary items of
the plant are; that is to say, the more thoroughly the acetylene is
purified, dried, and delivered at a strictly constant pressure to the
burners and stoves. Moreover, the efficient behaviour of the generator
itself will depend more upon the mechanical excellence and solidity of
its construction than (with one or two exceptions) upon the precise
system to which it belongs. And, lastly, the installation will, broadly
speaking, work the better, the larger the holder is in proportion to the
demands ever made upon it; while that holder will perform the whole duty
of a gasholder more effectually if it belongs to the rising variety than
if it is a displacement holder.
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