Coneless speaker uses plasma driver

“Jack’s Welding? My loudspeakers are low. Fill ‘em up with helium, please.”

Strange phone call? It’ll be routine for affluent audiophiles using a new speaker system, the Hill Type 1. Type 1 cabinets contain a helium bottle good for about 300 hours of playing time. Minute amounts of helium bleed into a glowing plasma, or highly ionized gas—heart of the speaker from Plasmatronics Inc. (2460 Alamo, S.E., Albuquerque, N.M. 87106).
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WORKSHOP WIZARD on the Stage

By William J. Duchaine

RUSSELL E. OAKES of Waukesha,

Wis., has been “making things” ever since he was big enough to wield a jackknife. Away back when makers of electric drills offered lathe attachments, Oakes had the yen for power tools. So he started equipping his shop, suffering occasional pangs of guilt over such an “extravagance,” and never dreaming he was laying the foundation for one of the most unusual careers in the U. S.
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These actually look a lot like modern headphones.

Pads Reduce Phone Pressure.

This new lightweight headset manufactured by Telex, Inc., Minneapolis, reduces ear fatigue by eliminating pressure on them. The two receivers rest on the sides of the head and sound is piped through plastic earpieces, which are individually adjustable. The set includes a volume control.

Movie Slot Machine Shows Pictures of Latest News Events

MOTION-PICTURE newsreels are on view for a nickel in a modern version of the old penny-arcade, animated-picture machine recently displayed at a Chicago, 111., convention of manufacturers. As shown at the right, the device has a motion-picture projector installed in the base of its cabinet. Film images are thrown on a small mirror that reflects them up to a ground-glass screen near the top of the cabinet, where they are viewed through an eyepiece by a customer. Designed for hotel lobbies, railroad stations, taverns, and other public places, the movie machine is entirely automatic, running through four separate scenes when a nickel is dropped into the slot, and rewinding for the next customer when the film ends.