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adjustment advantage amount angle applied arrangement attached axis bevil-wheels boring brought cast cast iron centre chisel chuck circular cross-slide cubic centimetre cutter cutting edge cylinder diameter distance drill-spindle drilling machine driven eccentric enable engraving extent face feed fixed flat foot-lathe gauge gearing given grinding grindstone groove hand headstock height hole horizontal inch iron kind lathe leading screw length lever mandril means measuring mechanical metal motion necessary obtained oilstone operation ordinary ornamental turning parallel piece pinion placed planing machine planing tools plate portion position power-lathes pressure produced pulley punch purpose represented in Fig revolve screw self-acting shaft shearing shown in Fig side Sir Joseph Whitworth slide slide-rest slotted speed spindle Spokeshave spur-wheel standard steel straight-edges sufficient surface surface-plate taper taps and dies teeth thickness threads tion tool tool-holder turning upper vertical wheel whilst Whitworth width wood workshop wrought iron
Page 2 - The second is of those who labour to extend the power of their country and its dominion among men. This certainly has more dignity, though not less covetousness. But if a man endeavour to establish and extend the power and dominion of the human race itself over the universe...
Page 1 - ... quellers of tyrannies, and the like) they decreed no higher honours than heroic. And certainly if a man rightly compare the two, he will find that this judgment of antiquity was just. For the benefits of discoveries may extend to the whole race of man, civil benefits only to particular pla ces ; the latter last not beyond a few ages, the former through all time.
Page 1 - In the first place then, the introduction of famous discoveries appears to hold by far the first place among human actions ; and this was the judgment of the former ages. For to the authors of inventions they awarded divine...
Page 273 - ... same moment. It may be observed that there are several points of difference between the cam and lever of the single-ended machine and those of the combined machine which we are now discussing. In the present instance the cams. do not act upon the extremities of the longer arms of the levers.—which they could not do without considerable addition to the total length of the machine. Consequently the power obtained is proportionately reduced, although in many cases the much greater economy of space...