In the event of a subsequent fire, the gas in the generator
would burn, but not explode; but in view of the greater illuminating
power per unit volume of carbide than per equal volume of compressed oil-
gas, a portable acetylene generator should be somewhat less objectionable
than broken cylinders of oil-gas if a fire should follow a railway
accident of the usual kind. More particularly by the use of "cartridges"
of carbide, a railway carriage generator can be constructed of sufficient
capacity to afford light for a long journey, or even a double journey, so
that attention would be only required (in the ordinary way) at one end of
the line.
Passing on from the generators used for the lighting of vehicles and for
portable lamps for indoor lighting to the considerably larger portable
generators now constructed for the supply of acetylene for welding
purposes and for "flare" lamps, it will be evident that they may embody
most or all of the points which are essential to the proper working of a
fixed generator for the supply of a small establishment. The holder will
generally be of the displacement type, but some of these larger portable
generators are equipped with a rising holder.
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