8. It shall not be possible for the lime sludge to choke any of the gas-
pipes in the apparatus, nor water-pipes if such be alternately used as
safety-valves.
9. In the use of a generator, regard shall be had to the danger of
stoppage of passage of the gas, and resulting increase of pressure, which
may arise from the freezing of the water. Where freezing may be
anticipated, steps shall be taken to prevent it.
10. The use of glass gauges shall be avoided as far as possible, and
where absolutely necessary they shall be effectively protected against
breakage.
11. The air space in the generator before charging shall be as small as
possible, _i.e._, the gas in the generating chamber shall not
contain more than 8 per cent. of air half a minute after commencement of
generation. A sample of the contents, drawn from the holder any time
after generation has commenced, shall not contain an explosive mixture,
_i.e._, more than 18 per cent, of air. This shall not apply to the
initial charges of the gasholder, when reasonable precautions are taken.
12. The apparatus shall produce no tarry or other heavy condensation
products from the decomposition of the carbide.
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