Abstract: An X-ray film cassette is formed of a pair of hinged plates, both arched inwardly about axes parallel to the hinge axis. One of the plates is formed from an inwardy curved piece of sheet metal prestressed by clamping it into an edge frame. The inside surfaces of each plate may carry X-ray intensifying screens. A method of prestressing the one plate is also disclosed.

Abstract: An apparatus for automatically performing analytic procedural steps on a fluid contained in a disposable deformable test pack. The apparatus consists of a means for filling the test pack with sample fluid, a means for controlling the environment of the test pack, a means for initiating reactions within the test pack, a means for analyzing the fluid in the test pack, and a transport means designed to hold the test pack and to transport it between the various operating stations. Associated circuitry combining method switchng and control logic make the operation of the instrument fully automatic.

Abstract: Performing analytical tests more easily, quickly and accurately by using a specially designed pouch-like container of pliable material. The container has within it a plurality of compartments, each compartment being capable of containing a different reagent and each compartment also being capable of releasing its contained reagent, independently of any other reagents present in the other compartments, into the area of the container not occupied by compartments. This latter area of the container is also adapted to receive the test sample for reaction with any single reagent or any combination of reagents released from the compartments.