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460
The Kinematograph Year Book.
Survey of Technical Developments
by R. HOWARD CRICKS, F.B.K.S., F.R.P.S.
THE event of 1947 which will probably prove to be of prime interest to kinematograph engineers in years to come has been, not some revolutionary invention or some novel piece of equipment, but the issue of the draft of the new Home Office Regulations.
Obviously conditions have altered considerably since the existing regulations were prepared, and it is everywhere agreed that revision of the regulations was overdue — such revision would in fact have been completed years ago but for the war.
H.O. Regulations
The draft regulations were summarised in the Kine. of June 19, 1947. Their effect upon the nontechnical branches of the Industry is referred to elsewhere. It remains for me to indicate their probable influence upon the technical aspects of the kinema — at least, so far as it s possible at the moment, for in face of strong opposition from every branch of the Industry, drastic revision is almost certain before they become law.
So far as the projector itself is concerned, the chief subject for argument has been the requirement that the gate heat should not cause the temperature to exceed 212° F. Apart from the question of whether it is always possible to maintain this low temperature without air
or water cooling, the problem arises of how the temperature is to be measured, since different methods of measurement are capable of giving widely differing results. A rear shutter is in any case to be obligatory.
Two points that are clarified by the new regulations are, first, that it is proposed to allow use of high-voltage discharge lamps for projection ; also for the installation of the arc rectifier in the operating room.
The one regulation which is possibly the most far-reaching, but to which no reasonably minded person could object, is the requirement that no film in poor mechanical condition shall be projected. It must be noted that the onus will, presumably, rest on the exhibitor to ensure that films are in satisfactory condition.
Safety Lighting
The bulk of the regulations refers to various aspects of the electrical equipment, including power substations which may be housed within a kinema building. The provision of a change-over switch for putting on battery-fed safety lighting in the event of mains failure is to be permitted. At present, of course, the safety lighting must be on continuously. Fourteen days' notice will be required before television equipment can be installed, and
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IN MIND
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SOUND EQUIPMENT