10. The seller of an apparatus must provide his customer with a sectional
drawing, a description of the apparatus, and a set of rules for attending
to it. These are to be supplied in duplicate, and one set is to be kept
hanging up in the apparatus shed.
III. Rules for Working the Apparatus.
1. The apparatus must only be opened by daylight for addition of water.
If the generator is one of those in which the entire charge of carbide is
not gasified at once, addition of fresh carbide must only be made by
daylight.
2. All work required by the plant, or by any portion of it, and all
ordinary attendance needed must be performed by daylight.
3. All water-seals must be carefully kept full.
4. When any part of an acetylene apparatus or a gas-meter freezes,
notwithstanding the precautions specified in II., 7, it must be thawed
only by pouring hot water into or over it; flames, burning fuel, or red-
hot iron bars must not be used.
5. Alterations to any part of an apparatus which involve the operations
of soldering or riveting, &c., _i.e._, in which a fire must be used,
or a spark may be produced by the impact of hammer on metal, must only be
carried out by daylight in the open air after the apparatus has been
taken to pieces.
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