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VARIOUS APPARATUS 67
trap may draw the horns offstage. If they are counterbalanced by weights they may easily be drawn into position. Another important matter that requires attention when movable horn equipment is being installed is the proper masking of stray sound, which might otherwise go into the space above the stage.
Information sufficient to permit a knowledge of the conduit runs for the complete installation is also obtained at the time of the survey. All the data collected is augmented by sketches prepared by the engineers, in conjunction with the blueprints of the building (when they are available), thus providing the home office survey staff with a complete picture of the requirements of the theatre. On the basis of the facts thus collated the type of sound projector system is selected, and the dates of shipment of equipment and installations are placed on schedule. Where architectural changes in the theatre are necessary, the local management is notified in the anticipation that necessary alterations may be completed prior to the actual introduction of the apparatus.
At the outset of an installation it is important for the engineer to establish satisfactory personal contacts with the local people and organizations that will be concerned in the work. This cooperation is necessary so that the work may proceed smoothly and be completed without delay, in time for the opening date that has been fixed. In fixing the date for installation, time for testing and rehearsals must be allowed. The engineer first meets the house manager and subsequently the projectionists, the house electrician, and stage hands, and familiarizes himself with the house conditions as to policy, operating hours, labour agreements, etc., so that he can determine the best time for the actual installation. It is necessary to find a competent electrical contractor — one, if possible, who already has knowledge of the theatre.