The shot is typically contained in a small container inside the shell casing. The hydrogen must be sealed against outward leakage where the shaft emerges from the casing. Oat bran is the outer casing of the oat. Most of the hole over this portion of casing had a 9.875 inch diameter. The barrel unscrewed for loading and removing the empty casing. Thermos bottles are smaller vacuum flasks fitted in a protective casing. Another failure mode is casing seal failure. These are typically high-quality breadboard modules mounted on a flat casing. The well is then flow tested through perforations in the casing. In front of the casing was a cam with spiral surfaces. Vent gases off the pump casing. It consists of two meshed gears that rotate in a closely fitted casing. Propellant combustion occurs inside the motor casing, which must contain the pressures developed. Polarity is usually stamped on the metal casing. This cable is a bundle of wires in a single casing.