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British Mining - R.W.Hunt - 1887

Page 625. Table showing the Duty (Work performed) by some of the best Cornish Pumping Engines during the past 40 years.

Year - 1880

Mines - Mellanear

Engine & Diameter of cylinder - Gundry’s 80 inch

Load on piston per square inch - 17.20

Actual Horse power employed - 81

Number of Strokes per minute - 3.10

Coal consumed per Horse power per hour - 4.2lbs

Pounds’ raised one foot high by consuming 112lbs of coal - 52.2 millions

Average Quantity of water drawn per minute - 380 imperial gallons