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A short piece of fire hose, usually 10 to 20 feet (6.1 m) long, of large diameter, greater than 2.5 inches (64 mm) and as large as 6 inches (150 mm), used to move water from a fire hydrant to the fire engine, when the fire apparatus is parked close to the hydrant. Solid stream A fire-fighting water stream emitted from a smooth-bore nozzle.
An empty fire extinguisher which was not replaced for years. Most countries in the world require regular fire extinguisher maintenance by a competent person to operate safely and effectively, as part of fire safety legislation. Lack of maintenance can lead to an extinguisher not discharging when required, or rupturing when pressurized.
A high velocity (HV), 1.8 lb (820 g), round was developed for the pom-pom, just before the Second World War, which raised the new gun muzzle velocity from 2,040 ft/s (622 m/s) to 2400 ft/s (732 m/s). Many older mountings were modified with conversion kits to fire HV ammunition, while most new mounts were factory built to fire HV ammunition.
In addition, 1,100 lb (500 kg) of liquid hydrogen are loaded over and above that required by the 6:1 oxidizer–fuel engine mixture ratio. This assures that cutoff from the depletion sensors is fuel-rich; oxidizer-rich engine shutdowns can cause burning and severe erosion of engine components, potentially leading to loss of the vehicle and crew.
This was designed to fire Armour-Piercing Discarding Sabot (APDS) rounds, which would match the penetration of the 'Littlejohn adaptor' shot while still allowing high-explosive (HE) shells to be fired. The claimed performance was better, the 1,295 m/s (4,250 ft/s) shot penetrating 85 mm (3.3 in) of armour at 60 degrees at 900 m (980 yd).
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