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THE PROJECTOR
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nose or diamond point cold chisel, cut small holes around the sides of the bolt holes or roughen their sides by gouging out pieces of concrete. This helps the metal filling to be well anchored.
Next set the anchor bolts in place, heads to the bottom, and fill the space around them with molten lead or babbitt.
(6) The supporting base may have an up-and-down adjustment with a proper locking device, for raising or lowering the projector mechanism. (7) Means must be provided by which the table which supports the lamphouse and mechanism may be tilted and locked rigidly in position to provide an upward projection angle of not less than 10 degrees and a downward angle of not less than 25 degrees. Greater projection angles are used, but it is poor practice.
In the supporting base of the pedestal type, provision should be made for carrying the various circuit wires upward through the supporting column. It is not essential, but makes a neater job.
(8) The projector must be set perfectly level sidewise. else the screen image will be out of level.
(9) Fig. 124 illustrates a modern type of pedestal.
The sloping platform supports the Iamphouse — the source of projection light — which is bolted to that platform. The projector mechanism and soundhead arc bolted to the member that protrudes at the right top of the illustration. Provisions are included in (he sloping platform whereby the Iamphouse mounted thereon can be shifted forward and back or left Figure 124 and right or both, to