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THE HONG KONG GOVERNMENT GAZETTE, AUGUST 16, 1940..
No 920.
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Hong Kong.
Order.
In exercise of the powers conferred on him by regulations 37, 44 and 64 of the Defence Regulations, 1940, the Officer Administering the Government hereby makes the following order-
1. This order may be cited as The Blackout Order, 1940.
2. In this order-
Interpretation.
(a) "air raid warden
means a member of the Hong Kong Corps of Air Raid Wardens;
(b) air raid warning means any audible or visible warning of hostile attack from the air and includes a sustained fluctuating or warbling note from sirens or such other audible warning as the Governor may prescribe by notification in the Gazette: a person shall be deemed to have received an air raid warning if he knows, or should by the exercise of reasonable diligence have known, that such a warning has been given; and "receipt of an air raid warning" shall be construed as receipt of such a warning by that person accordingly;
(c)"authorized head-lamp means a lamp of a power exceeding 7 watts, emitting a white light to the front of a vehicle and fitted with a mask so as to satisfy the following conditions
(i) that no light reaches the ground at any point nearer than 10 feet from the lamp or five times the height of the bottom of the lamp above ground level, whichever is the less;
(ii) that no light is projected above the horizontal when the vehicle is standing on a level surface;
(iii) that the light emitted is diffused by the insertion in the mask of a screen of some diffusing material or by other similar means;
(iv) that the intensity of illumination on a vertical surface at any point 10 feet from the lamp does not exceed 25 foot candles; and
(v) that no light is emitted except through the mask; (d) "authorized side-lamp means a lamp of a power not exceeding 7 watts, emitting a white light to the front of a vehicle and satisfying the following conditions
(i) that any reflector is painted with matt black paint or otherwise rendered ineffective;
(ii) that the light is emitted through a single aperture the area of which does not exceed that of a circle two inches in diameter;
(iii) that the aperture is partly obscured by inserting, behind the glass, paper or some other uncoloured material having a density equal to that of two sheets of newspaper, or by applying a thin coat of paint to the interior of the glass so as to produce approximately the same effect; and