Abstract: A system for helically wrapping a tape comprises tape twisting means, and, upstream of the twisting means, means for shaping the tape. The shaping means comprises a body over which the tape passes, the body having a first surface of at least partially cylindrical form and an outwardly curved edge surface extending along a side of the first surface. Tape supply means is arranged to feed the tape onto the first surface such that the tape is inclined to a plane at right angles to the axis of the first surface whereby an edge of the tape engages the curved edge surface and is thereby shaped in order to initiate wrapping. The system is particularly suitable for wrapping a paper tape around a nylon core.

Abstract: An ebullient cooling system employs a thyratron or other power device which is located within a hollow of a housing. The housing contains a liquid which completely surrounds the device. The liquid is of a type which provides high electrical insulation and which boils at a temperature compatible with the desired operating temperature of the thyratron. A heat exchanger is contained in the housing and is located above the liquid level. The heat exchanger is adapted to receive vapors which are produced when the device is operating and serves to condense the vapors back to a liquid to return the same to the reservoir. The power device is thusly cooled by the latent heat of vaporization and by the action of the heat exchanger when condensing the vapors back to a liquid.

Abstract: Apparatus and processes for breaking out a residual strand where one strand breaks in a strand combining operation. The invention makes use of the change in the line of travel of the residual strand to effect break out in the new line of travel.