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THE HONG KONG GOVERNMENT GAZETTE, JULY 17, 1931.
(19) The enclosure shall be in charge of a competent operator who shall be present in the enclosure during the whole time that the apparatus is in use. This shall not prevent the operator leaving the enclosure for a short period in case of need provided that a com- petent assistant is left in charge and the operator remains within. immediate call.
(20) No unauthorised person shall go into the enclosure or be allowed
to be within the barrier.
(21) In the case of buildings used habitually for cinematograph exhibi- tions the enclosure shall be outside the auditorium; and in the case of permanent buildings used habitually as aforesaid the enclosure shall also be permanent.
Provided that if the licensing authority is of opinion that, in the case of an existing building, compliance with either or both of the requirements in the preceding paragraph is impracticable or in the circumstances unnecessary for securing safety, the require- ment or requirements shall not apply.
In any new building where the enclosure is permanent, the en- closure shall also comply with the following requirements:-
(a) a window or skylight shall be provided.
(b) the entrance shall be from the open air.
(c) alternative means of egress shall be provided, unless the licensing authority is satisfied that compliance with this requirement is impracticable.
(22) The projecting apparatus shall be placed on firm supports con-
structed of fire-resisting material.
Every lantern shall be fitted with a metal shutter which can readily be inserted by hand between the source of light and the film gate, and every projector shall be fitted with a metal shutter so arranged as automatically to cut off the film-gate from the source of light when the projector stops.
The construction of the film gate shall be substantial and such as to afford ample heat-radiating surface. The passage for the film shall be sufficiently narrow to prevent flames travelling upwards or downwards from the light-opening.
(23) Projectors shall be fitted with two metal boxes of substantial con- struction to and from which the film shall be made to travel, unless both the film spools are contained in a metal chamber of substantial construction below the projector. There shall not be more than 2,000 feet of film in either of the two metal boxes.
The film boxes or chamber shall be made to close in such a manner, and shall be fitted with film slots so constructed, as to prevent the passage of flame to the interior of the box or chamber, and they shall remain so closed during the whole time that pro- jection is taking place.
(24) Take-up spools shall be mechanically driven and films shall be wound upon spools so that the wound film shall not at any time reach or project beyond the edges of the flanges of the spool.
(25) During the exhibition all films when not in use shall be kept in closed metal boxes of substantial construction. When in the en- closure not more than six spools shall be kept in one box at the same time.
(26) The total amount of film allowed to be kept in any building licenced or used as a place of Public entertainment shall not exceed five hundred and sixty reels or one ton,
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