Page:On the economy of machinery and manufactures - Babbage - 1846.djvu/318

284 {| class="_ruled_cols" cellpadding="5"
 * +A Table of the duty performed by Steam Engines in Cornwall, shewing the average of the whole for each year, and also the average duty of the best Engine in each Monthly Report.
 * 1813
 * 24
 * 19,456,000
 * 26,400,000
 * 1814
 * 29
 * 20,534,232
 * 32,000,000
 * 1815
 * 35
 * 20,526,160
 * 28,700,000
 * 1816
 * 32
 * 22,907,110
 * 32,400,000
 * 1817
 * 31
 * 26,502,259
 * 41,600,000
 * 1818
 * 32
 * 25,433,783
 * 39,300,000
 * 1819
 * 37
 * 26,252,620
 * 40,000,000
 * 1820
 * 37
 * 28,736,398
 * 41,300,000
 * 1821
 * 39
 * 28,223,382
 * 42,800,000
 * 1822
 * 45
 * 28,887,216
 * 42,500,000
 * 1823
 * 45
 * 28,156,162
 * 42,122,000
 * 1824
 * 45
 * 28,326,140
 * 43,500,000
 * 1825
 * 50
 * 32,000,741
 * 45,400,000
 * 1826
 * 48
 * 30,486,630
 * 45,200,000
 * 1827
 * 47
 * 32,100,000
 * 59,700,000
 * 1828
 * 54
 * 37,100,000
 * 76,763,000
 * 1829
 * 52
 * 41,220,000
 * 76,234,307
 * 1830
 * 55
 * 43,350,000
 * 75,885,519
 * 1831
 * 55
 * 44,700,000
 * 74,911,365
 * 1832
 * 60
 * 44,400,000
 * 79,294,114
 * 1833
 * 58
 * 46,000,000
 * 83,306,092
 * }
 * 1829
 * 52
 * 41,220,000
 * 76,234,307
 * 1830
 * 55
 * 43,350,000
 * 75,885,519
 * 1831
 * 55
 * 44,700,000
 * 74,911,365
 * 1832
 * 60
 * 44,400,000
 * 79,294,114
 * 1833
 * 58
 * 46,000,000
 * 83,306,092
 * }
 * 1833
 * 58
 * 46,000,000
 * 83,306,092
 * }
 * }

(342.) The advantage arising from registering the duty done by steam-engines in Cornwall has been so great that the proprietors of one of the largest mines, on which there are several engines, find it good economy to employ a man to measure the duty they perform every day. This daily report is fixed up at a particular hour, and the engine-men are always in waiting, anxious to know the state of their engines. As the general reports are made monthly, if accident