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material. Properly constructed baffles of sound absorbing material can be effectively used in reducing the passage of noise through conduits. It is good practice to surface exterior walls with cork and plaster, particularly in cases where ducts leading to and from rooms that should be acoustically separated run parallel or close to each other.
It should be remembered that so far as the admission of sound is concerned, there is no difference between intake and outlet ducts.
A system of sound insulation is no more effective as a whole than its least effective element. Pains should therefore be taken to provide
Fig. 5 — Reduction of sound in transmission of various types of partition walls.
Straight line in figure, single masonry wall
i. Double wall, bridged
2. Double wall; sawdust fill
3. Double wall, slag fill
4. Double wall, felt fill.
5. Double wall, no fill
6. Double wall, 4 inch separation
7. The same, bridged
8. Wood stud, lath, and plaster
9. Steel
10 1 3/4" Oak
doors and windows which are as « soundproof » as possible. A double door of as heavy construction as feasible, with the maximum possible separation of the two units, and provision for closing tightly, is the best means so far available. Care should of course be taken to procure a proper degree of insulation of motors, generators or other sources of vibration from the main structure of the studio or stage. Structural vibrations may be transmitted with amazing facility through an entire building.
It is fairly clear, as stated at the outset, that freedom from disturbing noise is a matter of careful detailed planning. The foregoing selves to indicate along broad lines the possible sources of trouble and the means by which these troubles may be avoided. On the whole, the acoustical problems of sound recording rooms are not seriously troublesome if taken into account from the beginning. They may be extremely annoying, if omitted and brought in only as an after' thought.
THE CINEMA AS AN AUXILIARY TO THE SCIENTIFIC ORGANIZATION OF LABOUR
While methodically pursuing its enquiries in respect of all those organizations which, from their intrinsic character, are in a position to
(Ed. Note). In later issues of the Review we shall publish some notable articles by Monsieur Urwick, Director of the Geneva Scientific Management Institute, by Prof. Fon
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