5 metres, i.e., 59 inches, of water column in generators used for the
ordinary purposes of illumination; but apparatus intended to supply gas
to the low-pressure oxy-acetylene blowpipe (see Chapter IX.) may develop
up to 2.5 metres, or 98.5 inches of water pressure, provided copper and
its alloys are entirely excluded from the plant and from the delivery-
pipes.
The NATIONAL BOARD OF FIRE UNDERWRITERS OF THE UNITED STATES OF AMERICA
has issued a set of rules and requirements, of which those relating to
acetylene generators and plant are reproduced below. The underwriters
state that, "To secure the largest measure of safety to life and
property, these rules for the installation of acetylene gas machines must
be observed."
RULES FOR THE INSTALLATION AND USE OF ACETYLENE GAS GENERATORS.
[Footnote: The "gallon" of these rules is, of course, the American
gallon, which is equal to 0.83 English standard gallon.]
The use of liquid acetylene or gas generated therefrom is absolutely
prohibited.
Failure to observe these rules is as liable to endanger life as property.
To secure the largest measure of safety to life and property, the
following rules for the installation of acetylene gas machines must be
observed.
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