C&W P6
The P6 was introduced 1937

This one No. 1066, the lowest known P6 is numbered 484, is in black gloss exterior blue/gray interior
Stand alone projector heads and mechanism only for the Raycophone J3 models
The J3 projector is fitted with a Cummings & Wilson P6 projector head No. 603.
C&W P6 No. 6.3 fitted to Raycophone sound head type 1
The sound plate is first screwed to the base plate. The exciter lamp holder, the scanning aperture and the optical magnifying barrel are next fixed to the backing plate. The optical barrel and lens assembly at its small end projects an enlarged image of the sound track from the scanning aperture to the scanning slit.
The dark coloured band covering observation port at the slit end of the tube can be slid away to enable accurate focusing of the sound track on the scanning slit.
The three screws at the top of the plate are the fixing position of the roller assembly

The scanning slit at the end of the optical barrel permits only a very narrow image of the sound track to reach the photo electric cell.

The light path from exciter lamp passes through its condenser, aperture plate, film, optical tube and scanning slit to photo electric cell.
The system, when correctly adjusted, focuses the actual sound track’s emulsion grains, putting the film base out of focus. This much improves the frequency response of the sound track.
The angle bracket and projector main plate is now attached to the top of the sound head.

The sound track can be seen at the scanning aperture. The screw at the right locks the condenser lens in best focus of the exciter lamps output at the aperture.

The sound roller shoe with its sound track position adjusting screw is now ready to be attached to the plate. The large screw in the centre of the holder locks the adjuster in place.
Both rollers are free wheeling and their movement is independent of the main drive shaft. They are driven by the film passing over them. The lower sprocket and shaft provides the driving movement for the film through the sound head. Add light oil to the roller oil cups and spin them to check for free movement. This picture shows the main sound shaft already installed and piece of film loaded to check the movement.