A System of Mechanical Philosophy, Bindi 4J. Murray, 1822 - 50 síður |
From inside the book
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Síða 546
... scapements for pendu- lums and balances very different . I. Of the Action of a Wheel and Pallet . THE scapement which has been in use for clocks and watches ever since their first appearance in Europe , is ex- tremely simple , and its ...
... scapements for pendu- lums and balances very different . I. Of the Action of a Wheel and Pallet . THE scapement which has been in use for clocks and watches ever since their first appearance in Europe , is ex- tremely simple , and its ...
Síða 548
... scapement of this kind , the motion of the wheel must be very hobbling and unequal , making a great step forward , and a short step backward , at every beat . This has occasioned the contrivance to get the name of the RECOILING SCAPEMENT ...
... scapement of this kind , the motion of the wheel must be very hobbling and unequal , making a great step forward , and a short step backward , at every beat . This has occasioned the contrivance to get the name of the RECOILING SCAPEMENT ...
Síða 549
... , namely , a farther reduc- tion of their size . This was accomplished very early ; and thus we obtained pocket watches , moved by a spiral spring , and regulated by a balance with the recoiling scapement , 3 WATCH - WORK . 549.
... , namely , a farther reduc- tion of their size . This was accomplished very early ; and thus we obtained pocket watches , moved by a spiral spring , and regulated by a balance with the recoiling scapement , 3 WATCH - WORK . 549.
Síða 550
... scapement , which is still in use for common watches . The hobbling motion of the crown wheel is very easily seen in ... scapement for a pendulum making small vibrations , without making use of the opposite motions of the two sides of ...
... scapement , which is still in use for common watches . The hobbling motion of the crown wheel is very easily seen in ... scapement for a pendulum making small vibrations , without making use of the opposite motions of the two sides of ...
Síða 551
... scapement we employ those teeth of the wheel which are moving in one direction ; whereas in the former scapement , opposite teeth were employed moving in contrary directions . Yet even here we must communicate an alter- nate motion to ...
... scapement we employ those teeth of the wheel which are moving in one direction ; whereas in the former scapement , opposite teeth were employed moving in contrary directions . Yet even here we must communicate an alter- nate motion to ...
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Common terms and phrases
action angle arch axis balance ball beats body canal centre coating conductor constipated cord curve cylinder Daniel Bernoulli degree density diameter diminished dipping needle direction distance effect elec electric fluid electrified electrometer electrophorus equal experiments explain farther force give glass globe greater harmony harpsichord headsails impulse inches increase length limma loadstone magnet major third manner mean tones motion moveable musical natural natural density nearly needle north pole observed octave overcharged pallet particle pendulum perfect perpendicular phenomena piece of iron pipe plate polarity position precisely produced proportion pulses quantity ratio reader redundant fluid redundant matter repel round sails scapement sensible shew ship side sound south pole stratum string suppose surface temperament tetrachords theory tion tooth touch tricity trumpet tune undercharged undulations velocity vibrations wheel whole wind wire
Vinsælir kaflar
Síða 353 - COMPASS, or the declination of the magnetic or mariner's needle from the meridian or true north and south line at the undermentioned places in the United Kingdom, estimated for the year 1875.
Síða 209 - Elsewhere, Prof. Robison remarks : " It is not saying too much of this work to affirm that it contains almost everything we know of magnetism. His unwearied diligence in searching every writing on the subject and in getting information from navigators, and his incessant occupation in experiments, have left very few facts unknown to him. We meet with many things in the writings of posterior inquirers, some of them of high reputation and of the present day, which are published and received as notable...
Síða 545 - PC, the tooth B continues to press on the pallet D, and thus accelerates the pendulum, both during its descent along the arch PH, and its ascent along the arch HG. It is no less evident, that when the pallet D, by turning round the axis XY, raises its point above the plane of the wheel, the tooth B escapes from it, and i drops on the pallet c, which is now nearly perpendicular. i presses c; to the right, and accelerates the motion of the pendulum along the arch GP.
Síða 411 - We are sorry to see this ; because we have great expectations from the future labours of this gentjeman in the field of harmonics, and his late work is rich in refined and valuable matter. We presume humbly to recommend to him attention to his own admonitions to a very young and ingenious gentleman, who, he thinks, proceeded too far in animadverting on the writings of Newton, Barrow, and other eminent mathematicians.
Síða 609 - Yet a ship is a machine. We know the forces which act on it, and we know the results of its construction — all these are as fixed as the laws of motion. What hinders this to be reduced to a set of practical maxims, as well founded and as logically deduced as the working of a steam-engine or a cotton-mill?
Síða 676 - ... all shivering: For these sails, continuing to draw with considerable force, and balancing each other tolerably fore and aft, keep up the ship's velocity very much, and thus maintain the power of the rudder. If we now let all fly when the...
Síða 613 - ... is precisely such as is stated in the theory. The principles of the art are therefore to be found in these treatises ; but false inferences have been drawn, by computing from erroneous quantities.
Síða 657 - When this position is attained, note carefully the form of the rope, that is, the angle which its two parts make with the horizon. Call this angle a. Every...
Síða 656 - We shall not be far mistaken in the deflection of each contiguous filament, as it quits the bottom and glides along the rudder ; but we neither know the velocity of these filaments, nor the deflection and velocity of the filaments gliding without them.
Síða 665 - ... forward by removing a part of the bows out of the water. It has not always this effect ; for the form of the harping aloft is frequently such that the tendency to gripe is diminished by immersing more of the bow in the •water.