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THREE-DIMENSIONAL MOTION PICTURES 151 showings was the Walker P. M. Polarized High Intensity, sold by National Theatre Supply Co. The Staticm aster brush is manufactured by Nuclear Products Co. of El Monte, Calif. A nuclear material—polonium—is built into its ferrule. The radiation from this metal slightly ionizes the air, neutralizing the static electricity that causes dust to cling to surfaces. ELECTRICAL INTERLOCK INSTALLATION The electrical interlock kit consists of the follow ing: Connecting cable (1) General Electric selsyn motors (2) Sprockets, to keep selsyn speed below 1200 rpm (4) Lengths of sprocket chain (2) Motor mounting plates (2) Motor mounting bolts (12) The two holding bolts at the left side of each drive motor are removed; two of the long bolts furnished are substituted—threaded up from the bottom on the regular motor bracket—and tightened; the motor mounting plate and sprockets installed on the selsyn fastened to them (after aligning) with washers and nuts. Each selsyn motor is then loosely mounted on its mounting plate and sprockets instated on the selsyn motor shaft and on the drive motor shaft (large sprocket on the selsyn). The silent-chain connection between selsyn sprocket and drive-motor sprocket is installed and adjusted, and the selsyn motor mounting bolts are then tightened down. Selsyn motors are inter-connected by means of the electrical cable supplied. Both projectors are turned by hand several times as necessary until each is in a position meeting these three requirements: (1) intermittent movement has just turned; (2) shutter is straight up and down, and