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34 MODERN MAGIC LANTERNS.
The company also disclaim all responsibility, risk, liability,
and the duties of common carriers as far as this traffic is
concerned. Cylinders are carried both by passenger and
goods trains, but in both cases have to be paid for, as the
companies decline to recognise them as passengers' luggage.
The various forms of protection mentioned above can now
be procured from several of the firms supplying lantern
requisites.
CHAPTER VI.
attiratorii,311canbecent (3a6 113tiniew, Etc.
THE oxy-calcium light is not sufficiently powerful for the
largest displays, and a substitute for coal gas enabling the
mixed jet, with its intense illuminating powers, to be used,
was sought for and to a great extent found in oxygen containing
as much as possible of ether vapour. If oxygen gas is passed
over a large surface of the volatile fluid, ether, it picks up
a quantity of that substance in the form of vapour, and
when saturated with it the two form an inflammable
but non-explosive gas, which can be burned in place of
hydrogen ; when the oxygen only contains a fraction of
the requisite amount of ether, it forms a powerful explosive
mixture.
The apparatus for saturating the gas with ether, or with
benzoline vapour, which has been used as a substitute, is
known as a saturator, a general idea of the arrangement for
the use of which can be gathered from Fig. 28. Only one
cylinder, E, and regulator, F, are required in such a case, the
oxygen on leaving it being taken in two directionsin one case
along the tube A to the oxygen tap of the jet, in the other
along B to the saturator c, whence it emerges by D to the
hydrogen tap. Saturators have been with more or less
justice under a cloud for some years, but within the last few
months the introduction of one or two forms which appear
to stand the most irrational treatment without exploding,
and which possess other advantages, seems to be bringing them
into favour again. One of the difficulties earlier inventors
o2