TWO:Let the reader compare a hammer with a wheel and axle, inclined plane, screw, or lever, as an agent for concentrating and applying power, noting the principles of its action first, and then considering its universal use, and he will conclude that, if there is a mechanical device that comprehends distinct principles, that device is the common hammer. It seems, indeed, to be one of those provisions to meet a human necessity, and without which mechanical industry could not be carried on. In the manipulation of nearly every kind of material, the hammer is continually necessary in order to exert a force beyond what the hands may do, unaided by mechanism to multiply their force. A carpenter in driving a spike requires a force of from one to two tons; a blacksmith requires a force of from five pounds to five tons to meet the requirements of his work; a stonemason applies a force of from one hundred to one thousand pounds in driving the edge of his tools; chipping, calking, in fact nearly all mechanical operations, consist more or less in blows, such blows being the application of accumulated force expended throughout a limited distance.
TWO:A finisher's engine lathe consists essentially of a strong inflexible shear or frame, a running spindle with from eight to sixteen changes of motion, a sliding head, or tail stock, and a sliding carriage to hold and move the tools.
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TWO:1. That the drop and valve, while they must act relatively, cannot move in the same time, or in direct unison.We now pass to a form of supernaturalism more characteristic than any other of the direction which mens thoughts were taking under the Roman empire, and more or less profoundly connected with all the other religious manifestations which have hitherto engaged our attention. This is the doctrine of immortality, a doctrine far more generally accepted in the first centuries of the Christian era, but quite apart from Christian influence, than is supposed by most persons. Here our most trustworthy information is derived from the epigraphic monuments. But for them, we might have continued to believe that public opinion on this subject was faithfully reflected by a few sceptical writers, who were, in truth, speaking only for themselves and for the numerically insignificant class to which they belonged. Not that the inscriptions all point one way and the books another way. On the contrary, there are epitaphs most distinctly repudiating the notion of a life beyond the grave, just as there are expressions let fall by men of learning which show that they accepted it as true. As much might be expected from the divisions then prevailing in the speculative world. Of all philosophical systems, Epicureanism was, at this time, the most widely diffused: its adherents rejected the belief in another world as a mischievous delusion; and many of them seem to have carefully provided that their convictions should be recorded on their tombs. The monument of one such philosopher, dedicated to eternal sleep, is still extant; others are dedicated to safe repose; others, again, speak of the opposite belief as a vain imagination. A favourite epitaph with persons of this school runs as follows:I was nothing and became, I was and am no more, so much is true. To speak otherwise is to lie, for I shall be no more.358 Sometimes,234 from the depths of their unconsciousness, the dead are made to express indifference to the loss of existence. Sometimes, in what was popularly believed to be the spirit of Epicureanism, but was, in reality, most alien to it, they exhort the passer-by to indulge his appetites freely, since death is the end of all.
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