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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.
13. CARE AND MAINTENANCE.--All charging and cleaning of apparatus, generation of gas and execution of repairs must be done during daylight hours only, and generators must not be manipulated or in any way tampered with in the presence of artificial light.
This will require gasholders of a capacity sufficient to supply all lights installed for the maximum lighting period, without the necessity of generation of gas at night or by artificial light.
In the operation of generators of the carbide-feed type it is important that only a limited amount of carbide be fed into a given body of water. An allowance of at least one gallon of generating water per pound of carbide must be made in every case, and when this limit has been reached the generator should be drained and flushed, and clean water introduced. These precautions are necessary to avoid over-heating during generation and accumulation of hard deposits of residuum in the generating chamber.
(Rule 14, referring to the storage of carbide, has been quoted in
Chapter II.
(page 19)).RULES FOR THE CONSTRUCTION OF GENERATORS.
The following Rules are intended to provide only against the more hazardous defects usually noted in apparatus of this kind. The Rules do not cover all details of construction nor the proper proportioning of parts, and devices which comply with these requirements alone are not necessarily suitable for listing as permissible for use. These points are often only developed in the examination required before permission is given for installation.
_Class A.--Stationary Apparatus for Isolated Installations._
15. GENERAL RULES. GENERATORS.--(_a_) Must be made of iron o