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HANDBOOK OF PROJECTION FOR
work unnecessarily hard, or that the motor will be stalled if one of the clamps strikes, as before described.
THE NEGATIVE CARBON is fed upward by feed screw L, acting through carbon clamp F. The feeding is not intermittent but continuous. The negative is not rotated. It may be fed by hand by means of crank R, Figs. 299 and 300.
INSTALLATION. — The lamp is installed in the lamphouse by the manufacturer, the lamp and lamphouse not being sold separately for an original installation. It is so adjusted by the manufacturer that the center of the positive carbon is exactly on the optical axis of the lens system. It is, however, possible that the adjustment may be altered in shipment, or it may be that you will have occasion to order a new high intensity lamp to install in place of an old one.
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Insulation
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Motor Connections
Figure 302.
On receipt of a new high intensity outfit, or when you install a new lamp in the place of an old one, you should set the alignment of the lamp, as follows : Secure a perfectly straight rod of steel or iron having the same diameter as the positive carbon (11 m.m. or about 7/16 of an inch) and long enough to reach from an inch or more back of knob Q to the front of the projection lens tube. Test the rod for straightness by rolling it on a perfectly flat surface. Remove the condenser lenses, open the projector mechanism gate, and take out both combinations of the projection lens, placing the empty lens barrel back in place in the holder. Remove the positive carbon and shove the iron rod through