Abstract: A method of forming a composite metal-ceramic helix structure suitable for TWT application. The method includes concentrically joining a metal cylinder disposed within a ceramic cylinder to form a high strength hermetic bond therebetween having good thermal conductivity. Prior to joining the cylinders a predetermined quantity of heat vaporizable liquid is disposed within the metal cylinder and its ends are sealed off. During the brazing process the liquid vaporizes ensuring intimate contact between the concentric cylinders. Thereafter the metal cylinder ends are removed and the resulting concentric structure machined into a helical shape.

Abstract: A silver recovery apparatus for use in conjunction with photographic development systems acting to remove metallic silver from the hypo bath. The present device includes an electrolytic cell within a closed chamber through which the hypo bath is bypassed. The silver contaminated hypo solution is passed through the electrolytic chamber with a uniform velocity and is distributed uniformly over an extended cathode surface without any moving parts within the chamber. This uniformity of velocity and distribution causes maximum deposition of silver onto the cathode so that the hypo solution returning to the development and fixing process is considerably rejuvenated and continues to operate at high efficiency.