Page:Walker (1888) The Severn Tunnel.djvu/301

188 inches diameter, 10-foot stroke; beam engines, horsepower per stroke from water lifted 7·66 each pump; ordinary strokes per minute average 5½, maximum plunger 10, bucket 12; lift 98 feet. These pumps take water from cutting and a length of tunnel; as a rule, one only works at a time.

Where the horse-power from water raised only is given, there were no indicators on the engines. The indicated horse-power will be about 25 per cent, more than the actual horse-power.

The deliveries of the pumps given above are theoretical The actual deliveries will be about 20 per cent. less. The pumps, therefore, are capable of raising about 6 million gallons per day, as stated in Colonel Rich’s report.

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