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Increase And Diminution Of Velocity
32. The fatigue produced on the muscles of the human frame d...

On The Exportation Of Machinery
437. A few years only have elapsed, since our workmen were n...

Registering Operations
65. One great advantage which we may derive from machinery is...

On The Influence Of Durability On Price
197. Having now considered the circumstances that modify what...

On Contriving Machinery
318. The power of inventing mechanical contrivances, and of ...

Saving Time In Natural Operations
47. The process of tanning will furnish us with a striking i...

Of Money As A Medium Of Exchange
166. In the earlier stages of societies the interchange of t...

Of Copying By Moulding
112. This method of producing multitudes of individuals havi...

Accumulating Power
20. Whenever the work to be done requires more force for its ...

Of Copying By Stamping
128. This mode of copying is extensively employed in the art...

Of Copying By Casting
105. The art of casting, by pouring substances in a fluid st...

On The Future Prospects Of Manufactures As Connected With Science
453. In reviewing the various processes offered as illustrat...

Extending The Time Of Action Of Forces
45. This is one of the most common and most useful of the em...

On The Division Of Labour
241. We have already mentioned what may, perhaps, appear par...

Regulating Power
27. Uniformity and steadiness in the rate at which machinery ...

Of Copying
82. The two last-mentioned sources of excellence in the work ...

On The Cost Of Each Separate Process In A Manufacture
253. The great competition introduced by machinery, and the ...

On The Effect Of Machinery In Reducing The Demand For Labour
404. One of the objections most frequently urged against mac...

Of Copying By Punching
133. This mode of copying consists in driving a steel punch ...

On Combinations Of Masters Against The Public
376. A species of combination occasionally takes place among...



Extending The Time Of Action Of Forces








45. This is one of the most common and most useful of the
employments of machinery. The half minute which we daily devote
to the winding-up of our watches is an exertion of labour almost
insensible; yet, by the aid of a few wheels, its effect is spread
over the whole twenty-four hours. In our clocks, this extension
of the time of action of the original force impressed is carried
still further; the better kind usually require winding up once in
eight days, and some are occasionally made to continue in action
during a month, or even a year. Another familiar illustration may
be noticed in our domestic furniture: the common jack by which
our meat is roasted, is a contrivance to enable the cook in a few
minutes to exert a force which the machine retails out during the
succeeding hour in turning the loaded spit; thus enabling her to
bestow her undivided attention on the other important duties of
her vocation. A great number of automatons and mechanical toys
moved by springs, may be classed under this division.

46. A small moving power, in the shape of a jack or a spring
with a train of wheels, is often of great convenience to the
experimental philosopher, and has been used with advantage in
magnetic and electric experiments where the rotation of a disk of
metal or other body is necessary, thus allowing to the enquirer
the unimpeded use of both his hands. A vane connected by a train
of wheels, and set in motion by a heavy weight, has also, on some
occasions, been employed in chemical processes, to keep a
solution in a state of agitation. Another object to which a
similar apparatus may be applied, is the polishing of small
specimens of minerals for optical experiments.





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Previous: Increase And Diminution Of Velocity



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