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8 inches from the centre. Then take a piece of cardboard about a foot long and near one end make a hole to fit snugly over the turntable spindle. Eight inches from this hole make another, through which you can push the end of a pencil. Then by swinging the card about the turntable centre, draw an arc on the motor board. With the card on the other turntable, repeat the process. Where the two arcs cross, you mount the pick-up.
When you are working the turntables, you must have enough light to see what you are doing. But you must not shine a lot of unwanted light on the screen. So mount a small pilot light near each pick-up. Pygmy neon lamps are ideal for this purpose, for their light is not intense, yet they give by far the clearest effect with stroboscopic markings.
Provide a strut to support the lid of the cabinet during a show. Then even the feeble light of the neons will be kept from the screen. A useful refinement is a bulldog clip screwed inside the lid to hold a cue sheet where it will be illuminated by a third pilot lamp.
Cue Sheets
To simplify presentation, prepare a cue sheet for each of your films. This is a table detailing the records required, the cues for change-over and the settings of the volume and fade-over controls. These control settings you indicate by reference to a sequence of numbers marked around each control knob. You may, for example, provide each control with numbers from 0 to 6. Then on a volume control, 6 corresponds to full volume and 0 to none. Similarly 0 on the fade-over control indicates full anti-clockwise rotation, i.e., full output from the left-hand pick-up. On the same control, 6 indicates full output from the other pick-up, 3 equals output from both pick-ups.
If you are using a radio set as an amplifier, there is no need to mark a scale permanently against any of its controls. Instead, cut slots in a piece of card so that it will slip behind
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