Historical Statement of the Improvements Made in the Duty Performed by the Steam Engines in Cornwall, from the Commencement of the Publication of the Monthly ReportsSimpkin, Marshall, and Company, 1839 - 152 ページ |
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16 inch pump 70 inches 9 feet 9 inches August September October aver average duty Binner Downs Boulton and Watt bushel of coal coal in bushels coal in Length Consolidated Mines cylinder December Diameter discharging therein ditto Dolcoath Drawing from 110 engines reported fathoms feet 6 inches feet 9 feet stroke foot high Fowey Fowey Consols gallons per minute galls Grose Hocking and Loam inches stroke January February March June Lanescot lifted one foot Load in pounds Load in strokes Load per Consump Load per ENGINES Load per square low the adit Marazion millions Months November Number ENGINES Number of Length Number of strokes piston Poldice Polgooth Pounds lifted Shammal single square Consump square inch square tion steam engine Stroke Stroke strokes per minute strokes REMARKS suming a bushel TABLE II.-Continued therein the water tion of coal tion of Number Total TRESKERBY United Mines WHEAL ALFRED Wheal Towan Woolf
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14 ページ - April, 1814, it had consumed only 12671 bushels of coal, performed the average duty of 30,5 millions, and worked at the rate of 5,7 strokes per minute. Thus pumping from a deeper mine, a seventh part more water, with the consumption of 7440 bushels of coal per annum less ; or a saving by one engine alone of about £300 on the cost of the preceding year. This engine maintained its standing to the end of the year ; so that its average duty for the twelve months was 32 millions.
103 ページ - A bushel of coal weighed, and found to be94lbs. 4th — The coal-shed door immediately locked, the key kept by the committee and the door sealed. 5th — The committee's counter at starting registered 00,000,660, and Mr. Lean, the reporter's counter, 02,187,480. The counters locked and sealed as soon as their state was ascertained, and the keys delivered to the chairman of the committee. 6th — Quantity of grease delivered for the consumption of the engine 12lbs, and oil 1 quart.
99 ページ - Duty as recorded at the trial 125,095,713 lifted one foot high by the consumption of one bushel of coal; average duty for the last six months 89,964,183;— balance in favour of 24 hours
103 ページ - Quantity of grease delivered for the consumption of the engine 12lbs, and oil 1 quart. 7th — State of the fires strictly examined. 8th — Water in the boilers found to be at the regular working gauge. 9th— -Steam gauge at starting 36^. 10th — Stroke in the shaft 9 feet 3 inches. The trial commenced on Thursday, at 28 minutes after 1 o'clock, PM During the trial, which lasted 24 hours and 27 minutes, the steam gauge fluctuated between 36^ and 45, shewing a pressure of from 36^ to 45 lbs.
104 ページ - Duty, 125,095,713 lbs. lifted one foot high by a bushel of coal. Four bushels of coal remained unconsumed at the conclusion of the experiment, making the whole consumption 24 bushels. At the time the engine stopped, the fires were in equally as good, if not better, condition, than at the commencement of the investigation. The water in the boilers was higher at the conclusion than at the commencement of the experiment. (Signed) JOHN BUDGE, Chairman. SAMUEL LYLE, THOMAS PETHER1CK, JOHN BRAY, JAMES...
4 ページ - And by this criterion, one bushel of coals, weighing 841bs. has been found to perform a duty of thirty, forty, and even fifty millions ; augmenting with improvements, chiefly in the fire-place, which produce a more rapid combustion, with consequently increased temperature, and a more complete absorption of the generated heat ; in addition to expansive working, and to the use of steam raised considerably above atmospheric pressure.
12 ページ - ... work for many years, and published reports of the results of the trials. Of these reports Dr. Pole says : "The publication produced an extraordinary effect in improving the duty of the engines. Engineers were stimulated to emulation amongst themselves. The practice of reporting is thought to have been attended with more benefit to the county than any other single event excepting only the invention of the steam engine itself.