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Historical Statement of the Improvements made in the duty performed by the Steam Engines in Cornwall – Thomas Lean & brother (1839)

Page 23. Table I – Shewing the work performed by the pumping engines reported in 1814.

EnginesMonths Load per Consumption Number Length of Load in Pounds lifted Number
square inch of coal in of strokes the stroke pounds one foot high of strokes
on the piston bushels in the pumps by consuming per minute
a bushel of coal
1814 Feet Inches
MillanearSeptember 4,9 1492 291440 6 - 0 16027 18,783815 5,6
October 5,0 1008 203660 - 16470 19,965953 5,0
November 5,9 1006 184570 - 19683 21,667343 4,9
December 6,1 2292 393000 - 19990 20,565628 7,4
1815
January 4,9 3062 562200 - 21151 23,300637 11,8
February 6,9 2448 473520 - 22763 26,418470 13,1
March - 2651 525380 - - 27,067176 12,8
April - 2862 547630 - - 26,133546 13,6
May - 3492 574100 - - 24,564357 11,8
------ ------------- ------
Total 20313 Average 23,163002 10,63

Remarks -

Diameter of the cylinder, 58 inches; length of the stroke 7ft 6ins; working single – W.Sims, Engineer.

Drawing from 48 fathoms below the adit, and discharging therein the water of a 14 inch pump, 6 feet stroke = 40,08 gallons; average 426,17 gallons per minute.


Page 92. Table III – Shewing the work performed by the pumping engines reported in 1828.

EnginesMonths Load per Consumption Number Length of Load inPounds lifted Number
square inch of coal in of strokes the stroke pounds one foot high of strokes
on the piston bushels in the pumps by consuming per minute
a bushel of coal
Feet Inches
Wheal VorJanuary 14,2 4624 296600 7-6 0 95307 45,850004 6,86
(Trelawney's) February- 4287 287630 - - 47,958629 6,28
March - 2987 215600 - - 51,594047 6,2
April - 3750 291420 - - 55,548731 5,9
May - 2473 207700 - - 60,034160 5,0
June - 3329 268020 - - 57,549223 5,8
July - 2970 250400 - - 60,264830 6,18
August 14,8 3000 - - 99316 - -
September - 3937 285710 - - 54,055577 6,0
October - 3076 230250 - - 55,756280 5,3
November 14,96 3259 265400 - 100085 61,128932 5,75
December - 3330 247370 - - 55,761320 5,18
Total 41022 Average55,045612 5,86

Remarks -

Diameter of the cylinder, 80 inches; length of the stroke 10ft; working single – Sims & Richards, Engineers.

Drawing from 192 fathoms below the adit, and discharging therein the water of a 15 inch pump, 7 feet 6 inches stroke = 57,52 gallons; average 337,06 gallons per minute.
Pearce’s 189,44
Western 230,79
Old 86,22
Total 843,51 gallons per minute from Wheal Vor


Page 131. Table IV – Shewing the work performed by the pumping engines reported in 1835.

EnginesMonths Load per Consumption Number Length of Load inPounds lifted Number
square inch of coal in of strokes the stroke pounds one foot high of strokes
on the piston bushels in the pumps by consuming per minute
a bushel of coal
Feet Inches
Wheal VorJanuary 15,49 3275 269450 7-6 0 103802 64,052173 6,68
(Trelawney's)February- 3520 283590 - - 62,721326 7,03
March - 4770 350070 - - 57,125166 6,94
April 15,77 3774 283990 - 104355 58,894627 7,0
May - 4230 353370 - - 64,382848 7,0
June 15,8 3527 287080 - 104632 63,873875 7,12
July - 3371 275860 - - 64,217851 6,84
August 15,65 4411 340450 - 104909 60,728183 6,75
September - 3438 258120 - - 59,073104 6,4
October - 3431 270060 - - 61,931779 6,7
November - 4330 340020 - - 61,786070 6,74
December - 3055 242870 - - 62,551347 6,75
Total 45132 Average61,868195 6,83

Remarks -

Diameter of the cylinder, 80 inches; length of the stroke 10ft; working single – Richards, Engineer.

Drawing from 226 fathoms below the adit, and discharging therein the water of a 14 inch pump, 7 feet 6 inches stroke = 50,11 gallons; average 342,25 gallons per minute.


Page 137. Annual figures ( Millanear 1814/15)

Coal in bushels of 94 lbs = 20,313
Water discharged in Imperial gallons = 223,995,000
Water drawn 100 fathoms deep for one ton of coal = 93,000 Imperial gallons
Pounds lifted one foot high for one bushel of coal = 23, 163, 002