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154 THE LOCOMOTIVE. [October, tion of the heat produced into various forms of mechanical euergy lias gone on for a hundred years, increasing in magnitude at a rate which is almost bewildering, creating conditions of which few persons grasp the full significance, and affecting the whole human race in its relation to its environment more profoundly than any other event in ils history. The nature of the changes thus wrought is well known among intelligeut persons, but their extent is so little appreciated that it will be useful to- consider, briefly, that phase of the subject, and especially to endeavor to present it in such a way as to empha- size the purely power aspect of the question. Everybody has a more or less correct idea of the enormous development of steam navigation and railway systems and of the cheapening of transportation brought about by it; of the phenomenal growth and widespread distribution of manufacturing estab- lishments; of the generation and use of electricity as a convenient means of transmitting energy: and of many other things characteristic of the industrial revolution through which we are passing. It is instructive, however, to reduce it all to the daily combustion of a certain, rapidly increasing number of pounds of coal, for these may be easily converted into their muscle equivalent. And since by far the greater part of the coal out put goes directly or indirectly into the production of power, no attempt will be made to separate from the whole that which is used purely for heating purposes, and indeed, the very general consideration of the subject to which this discussion must be restricted does not require such separation. Furthermore, for convenience in under- standing numerical relations, it, may be assumed that the combustion of one pound of coal under the favorable conditions of modern practice produces available energy equal to the work of one horse for one hour, and that a horse-power is equal to the power of seven men. The total quantity of coal taken in any given year from the mines of the whole world cannot be very accurately ascertained, but from the best, available information it may be assumed to have been about 700,000,000 tons of 2,000 pounds each for the year 1900, the la
1901.] THE LOCOMOTIVE. 455 thus put at disposal is equal to that of sixteen laborers for every inhabitant. Thus, in the average, every man, woman, and child has sixteen able-bodied slaves working for him ten hours a day and three hundred days in a year. In a somewhat less degree the same is true of the whole English-speaking popula- tion of the globe. The mines of Great Britain and the United States furnish about three-quarters of the entire annual output of coal, and both nations jointly control three- quarters of the power of the world, for which reason alone they are easily the controllin
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THE LOCOMOTIVE. [January, fl u* "«
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4 THE LOCOMOTIVE. [January, (240.)
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Q THE LOCOMOTIVE. [January, (265.)
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12 THE LOCOMOTIVE. [January. with s
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Incorporated 1866. Charter Per- pet
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: 20 THE LOCOMOTIVE. [February, Ins
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22 THE LOCOMOTIVE
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94 THE LOCOMOTIVE. [February. Of de
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26 T PIE LOCOMOTIVE. [February, fac
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28 THE LOCOMOTIVE. [February. HARTF
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30 THE LOCOMOTIVE. [February, Gray
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34 THE LOCOMOTIVE [March, warped su
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36 THE LOCOMOTIVE. |M AI*CH . and t
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38 THE LOCOMOTIVE [March, The total
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40 THE LOCOMOTIVE. [March, W)kt Utt
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42 THE LOCO M T I V E . [March, tes
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44 THE LOCOMOTIVE. [March, have som
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46 THE LOCOMOTIVE. - [March, U. S.
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50 THE LOCOMOTIVE. [April, to the b
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52 THE LOCOMOTIVE. [April, above),
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54 THE LOCOMOTIVE. [April, (14.)
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56 THE LOCOMOTIVE. [April, SI (it i
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58 THE LOCOMOTIVE. [April, image wi
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60 THE LOCOMOTIVE [April, estimates
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62 THE LOCOMOTIVE. [April, problem
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66 THE LOCOMOTIVE. [May, 2.25 —0.
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68 THE LOCOMOTIVE. [.May, by Charle
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70 THE LOCOMOTIVE. [May, the entire
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72 THE LOCOMOTIVE. [May, The compet
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74 THE LOCOMOTIVE. [May, SB lit Xtt
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76 THE LOCOMOTIVE. [May, the main e
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73 THE LOCOMOTIVE. [May, Greece has
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1901.] THE LOCOMOTIVE. 83 (It may h
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1901.] THE LOCOMOTIVE. a 85 Again,
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1901.] THE LOCOMOTIVE. qj and consi
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1901.] THE LOCOMOTIVE. 59 (98.) —
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1901.] THE LOCOMOTIVE. Q^ How Cloth
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1901.] THE LOCOMOTIVE. §3 compound
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1901.] THE LOCOMOTIVE. 95 cottonsee
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She jfttotmrtttre* PUBLISHED BY THE
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100 THE LOCOMOTIVE. [July, near Ogd
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102 THE LOCOMOTIVE. [July, t S**iMI
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Page 112 and 113: 106 THE LOCOMOTIVE. [July, material
Page 114 and 115: 108 THE LOCOMOTIVE. [July, complete
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Page 118 and 119: Incorporated 1866. Charter Per- pet
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Page 156 and 157: ^50 THE L C OMOTIVE. |October, HART
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Page 198: Incorporated 1866. Chartd Per- petu
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