In fact,
setting on one side apparatus which belong to a notoriously defective
system and such as are constructed in large sizes on a system that is
only free from overheating, &c., in small sizes; setting aside all
generators which are provided with only one decomposing chamber when they
are of a capacity to require two or more smaller ones that can more
efficiently be cooled with water jackets; and setting aside any form of
plant which on examination is likely to exhibit any of the more serious
objections indicated in this and the previous chapters, there is
comparatively little to choose, from the chemical and physical points of
view, between the different types of generators now on the markets. A
selection may rather be made on mechanical grounds. The generator must be
well able to produce gas as rapidly as it will ever be required during
the longest or coldest evening; it must be so large that several more
brackets or burners can be added to the service after the installation is
complete. It must be so strong that it will bear careless handling and
the frequent rough manipulation of its parts. It must be built of stout
enough material not to rust out in a few years.
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