Jan. 17.] THE NEW ZEALAND GAZETTE. 55

(b) It shall be thoroughly steamed by means of steam jets
for such period as will ensure the vaporization of all
volatile oil :
(c) After it has been steamed—(i) All covers of manholes
and other openings therein shall be removed, and it
shall be thoroughly ventilated, by mechanical or other
efficient means, so as to ensure the removal of all oil
vapour ; and (ii) the interior surfaces shall, if any
deposit remains thereon, be washed or scraped down.

110. Where work is being carried out on any oil-tank
     in respect of which a certificate of test is required under
     Regulation 108,—
     (a) No lamp other than suitable enclosed safety-lamps or
     electric lamps shall be used ; and
     (b) No rivet or other fires and no naked lights shall be taken
     into the tank and, whenever practicable, heated rivets
     shall be passed through tubes :

Provided that any or all of the requirements of this regula-
tion may be dispensed with on the written authority of the
person giving the certificate of test under Regulation 108 hereof.

111. (a) Adequate ventilation to secure the removal of
     injurious fumes or gas shall be provided where, in any enclosed
     or confined space,—
     (i) Painting is being carried on ;
     (ii) An oxy-acetylene burner or electric-welding apparatus is
     being used ;
     (iii) Riveting is being carried on which is likely to give rise
     to injurious fumes ;
     (iv) An acetylene-generating plant is installed.
     (b) Rivet-fires shall not be taken into or used in a confined
     or enclosed space unless there is adequate natural ventilation
     to prevent the accumulation of fumes or gas.

112. An acetylene-generating plant or a cylinder containing
     dissolved or compressed acetylene or compressed oxygen shall
     not be installed or placed within 15 ft. of any boiler, furnace,
     or other source of heat.

113. Before any person attends or operates an acetylene-
     generating plant he shall be fully instructed in the working of
     the same, and a copy of the maker’s instructions for such plants
     shall be available for his use at all times.

114. No person shall smoke in or take a naked light or a
     lamp, other than a properly enclosed electric lamp, into any
     acetylene-generator house, or in or into dangerous proximity to
     any acetylene-generating plant in the open air or on board a
     ship, unless such plant has been thoroughly cleansed and freed
     from any calcium carbide and acetylene gas.

115. Whenever practicable the charging and cleaning of
     acetylene-generators shall be done during daylight. Partially
     spent carbide shall not be recharged into a generator of the
     dipping type.

116. A prominent notice prohibiting smoking and the use of
     naked lights or lamps other than properly enclosed electric lamps
     shall be exhibited on or near every acetylene-generating plant
     whilst the same is charged or being cleaned.

117. A properly constructed and efficient back-pressure valve
     shall be provided and maintained in the acetylene-supply pipe
     between each burner or blowpipe and the acetylene-generator
     from which it is supplied. Such back-pressure valve shall be
     placed as near as practicable to the burner or blowpipe and shall
     be examined daily by the person using the burner or blowpipe.

118. Pipes for the supply of acetylene and oxygen to oxy-
     acetylene burners or blowpipes shall be of sound and suitable
     material, and such pipes shall be attached to the burner or blow-
     pipe and other connections by means of suitable clips or other
     equally effective appliances.

119. Efficient reducing and regulating valves for reducing
     the pressure of the gases shall be provided and maintained in
     connection with all cylinders containing compressed or dissolved
     acetylene or oxygen whilst the gases from such cylinders are
     being used in any process of oxy-acetylene welding or cutting.