Abstract: A container is formed by locating two panels in a jig so that the two panels have their adjacent edges nearly touching, the panels being in perpendicular planes. A mould is provided at the adjacent edges of the panels, and a casting resin is introduced to the mould to secure the panels together. Two pairs of panels thus formed are joined together in a similar way to form the walls of a container, and a base and lid are also connected to the walls in a similar way. The casting resin is a cold curing casting resin which, when cured is flexible. The panels are thus interconnected by flexible joints. The container is resistant against damage when dropped.

Abstract: The equilibrium relative humidity over a substance may be determined by the following method. The sample of the substance is placed in a lower compartment of a diffusion chamber and a dried gas is then passed through an upper compartment of the chamber which is partitioned from the lower by a disc of water vapor permeable non-hygroscopic material. When the rate of diffusion of water vapor through the disc from the lower to the upper compartment becomes constant the equilibrium relative humidity of the sample is directly related to the moisture concentration in the sweep gas and can be readily determined from a suitable calibration graph for the disc.