10. FOUNDATIONS.--(_a_) Must be of brick, stone or concrete.
(_b_) Must be so arranged that the machine will be level and so that
strain will not be brought upon the connexions.
11. GAS-HOUSES.--(_a_) Must be constructed entirely of non-
combustible material and must not be lighted by any system of
illumination involving open flames.
(_b_) Must be heated, where artificial heating is necessary to
prevent freezing, by steam or hot-water systems, the heater to be located
in a separate building, and no open flames to be permitted within
generator enclosures.
(_c_) Must be kept closed and locked excepting during daylight
hours.
(_d_) Must be provided with a permanent and effective system of
ventilation which will be operative at all times, regardless of the
periods of operation of the plant.
12. ESCAPE-PIPES.--Each generator must be provided with a vent-pipe of
ample size, substantially installed, without traps. It must be carried to
a suitable point outside the building and terminate in an approved hood
located at least 12 feet above ground and remote from windows.
The hood must be constructed in such a manner that it cannot be
obstructed by rain, snow, ice, insects or birds.
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