A System of Mechanical Philosophy, Bindi 4J. Murray, 1822 - 50 síður |
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Síða 271
... impulse . When the dissimilar poles of two mag- nets A and B ( Plate III . fig . 13. ) face each other , the curves formed by the filings considerably resemble those which surround a single magnet , and give the whole somewhat of the ...
... impulse . When the dissimilar poles of two mag- nets A and B ( Plate III . fig . 13. ) face each other , the curves formed by the filings considerably resemble those which surround a single magnet , and give the whole somewhat of the ...
Síða 313
... impulse , must have another stream to impel this into its curves . sion , this magnetic stream must lose tion equal to what it communicates . this ? What directs it in a particular course through the magnet ? And what is it that can ...
... impulse , must have another stream to impel this into its curves . sion , this magnetic stream must lose tion equal to what it communicates . this ? What directs it in a particular course through the magnet ? And what is it that can ...
Síða 456
... impulse on this membrane . The point therefore is to find what con- course of feeble undulations will produce or be equivalent to a great one . The reasonings of all these restorers of the speaking trumpet are almost equally specious ...
... impulse on this membrane . The point therefore is to find what con- course of feeble undulations will produce or be equivalent to a great one . The reasonings of all these restorers of the speaking trumpet are almost equally specious ...
Síða 476
... impulse on the ear . This is the object in view in the parabolic trumpet . All the undula- tions are converted into others which are in planes perpen- dicular to the axis of the instrument ; so that the same little mass of air is ...
... impulse on the ear . This is the object in view in the parabolic trumpet . All the undula- tions are converted into others which are in planes perpen- dicular to the axis of the instrument ; so that the same little mass of air is ...
Síða 551
... impulse already described ; and is so far from being obvious , that the manner of action has been misunderstood , even by men of science , and writers of systems of mechanics . In this scapement we employ those teeth of the wheel which ...
... impulse already described ; and is so far from being obvious , that the manner of action has been misunderstood , even by men of science , and writers of systems of mechanics . In this scapement we employ those teeth of the wheel which ...
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Common terms and phrases
action angle appear arch axis balance ball beats body canal centre coating concord 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 402 - When this was repeated 720 times in a second, the sound g in alt was most smoothly uttered, equal in sweetness to a clear female voice. When the frequency was reduced to 360, the sound was that of a clear, but rather a harsh man's voice. The cock was now altered in such a manner that it never shut the hole entirely, but left about one-third of it open. When this was repeated 720 times in a second, the sound was uncommonly smooth and sweet. When reduced to 360, the sound was more mellow than any man's...
Síða 315 - The magnetic fluid moves through, the pores of iron and soft steel with very little obstruction ; but its motion is more and more obstructed as the steel increases in hardness or temper, and it moves with the greatest difficulty in hard-tempered steel and the ores of iron.
Síða 613 - ... of the chief propositions, the reasonings remain in full force, and the modus operandi 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 409 - We are sorry to see this, because we have great expectations from the labours of this gentleman 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 678 - Thus a ship lying to is not like a mere log, but has a certain motion which keeps her under command. To get under weigh again, we...
Síða 674 - ... 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 644 - ... gives an impulse as great as the theory allows to an incidence of 40. We may therefore, on all occasions, keep the yards more square ; and the loss which, we sustain by the diminution of the very oblique impulse will be more than compensated by its more favourable direction with respect to the ship's keel. Let us take an example of this. Suppose the wind about two points before the In.am, making an angle of 68° with the keel. The theory assigns 43° for the inclination of the wind to the sail,...
Síða 628 - The telescope must always be pointed ahead of the real direction of the star, in the *-ame manner as the vane is always in a direction ahead of the wind ; and thus he ascertained the progressive motion of light, and discovered the proportion of its velocity to the velocity of the earth in its orbit, by observing the deviation which was necessarily given to the telescope.
Síða 663 - ... 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.