The freezing machines were kept at work for 200 days, and 2191 tons of coal were consumed in supplying steam for the compressors and circulating pumps. [Please select]
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One of the air compressors was exceptionally large and at times operated four drills. [Please select]
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Three cars were fitted up, one for each gang, each car being equipped with a motor-driven air compressor, water for cooling the compressors being obtained from the fire plugs along the route. [Please select]
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The air compressors were taken temporarily from those in use in the repair shops, no special machines being bought for the purpose. [Please select]
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