Abstract: A load selector for switching over from one tap of a step transformer to the next includes fixed step contacts disposed on a circle and connected to taps of a step transformer. At least two switch contacts per phase are disposed in common on a pivotable contact carrier and are simultaneously pivotable on the circle. Two vacuum switches per phase are electrically built into the contact carrier and connected in series with the switch contacts. A cam race is disposed along the circle. Rollers run along the cam race for actuating the vacuum switches. The cam race and the rollers are current free. A slip ring is coaxial with the cam race and the circle. The cam race is disposed axially between and spaced apart from the fixed step contacts and the slip ring. Slip contacts slide on the slip ring. Each of the vacuum switches are eletrically connected between a respective one of the switch contacts and a respective one of the slip contacts.

Abstract: A gas drying system for use in removing a liquid from a substrate comprises a carrier adapted to support the substrate wherein the parts of the carrier that make contact with the substrate have a surface wettable by the liquid and the wettable surface has a roughened surface of a material that is capable of being hydroxylated, and a dryer for exposing the substrate to a stream of ambient-temperature gas.

Abstract: A transducer assembly adapted to oscillate at an ultrasonic frequency comprises a metallic foil having a back surface, at least one transducer having one face thereof mounted adjacent to the back surface by conductive means disposed therebetween, and insulating means disposed in the area adjacent to the back surface and surrounding the edges of the transducer for supporting the foil and transducer in relatively fixed relationship.