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plicity and minimal maintenance. It operates immediately adjacent <br />to a `gob` area and is regularly subjected to 'blows' from lumps of • <br />falling coal and rock. <br />The hydraulic monitor is basically a series of short lengths of <br />various shapes of high strength pipe and hinge joints which are <br />used to direct the water through a stream shaper and nozzle so that <br />the water jet emitted from the nozzle is compact and retains its <br />shape over a long distance to best cut the coal. Movement of the <br />nozzle end of the monitor is affected by simple arrangement of <br />hydraulically powered rams o-rYiich enable the water jets to be <br />remotely directed in almost any direction with a minimum of effort <br />by the operator. <br />9.2.1.2.2 Feeder-Breaker <br />This is a specially designed version of one of the many feeder- <br />breakers in common use in most, coal mines. It is skid mounted, <br />powered by a waterproof electric motor, and can be used as a base • <br />off which the monitor works. <br />9.2.1.2.3 Development Machine:> <br />To develop the inseam roadways and keep development ahead of tt~e <br />monitor it is necessary to operate two heading machines developing <br />roadways on a continuous basis per operating panel. These units <br />mechanically cut the coal, directing it into a coal-water slurry <br />system. They do not require shuttle cars or similar coal transport <br />equipment. Consequently they are more efficient and economical <br />when considered as a complete development equipment package. <br />9.2.1.2.9 Materials and Personnel Transportation <br />Although fewer people are required to operate a hydraulic mine <br />compared with other underground systems it is still important to <br />NCIG - Coal Ridge #1 4-6 ABC/1145/910509 • <br />