A System of Mechanical Philosophy, Bindi 4

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J. Murray, 1822 - 50 síđur
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Síđa 404 - Robinson, and his device was the first and simplest form of the siren. A stopcock was so constructed that it opened and shut the passage of a pipe 720 times in a second. Air from the wind-chest of an organ being allowed to pass along the pipe during the rotation of the cock, a musical sound was most smoothly uttered.
Síđa 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.
Síđa 650 - A ship must be considered as a lever acted on in different parts by forces in different directions, and the whole balancing each other round that point or axis where the equivalent of all the resisting forces passes. This may be considered as a point supported by this resisting force, and as a sort of fulcrum : therefore, in order that the si ii|> may maintain her position, the energies or momenta of all the impelling forces round this point must balance each other.
Síđa 208 - This work of Dr. Gilbert's relates chiefly to the loadstone, and what we call magnets, that is, pieces of steel which have acquired properties similar to those of the loadstone. But he extends the term magnetism, and the epithet magnetic, to all bodies which are affected by loadstones and magnets in a manner similar t» that in which they affect each other.
Síđa 547 - 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.
Síđa 646 - ... 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 x'ery oblique impulse will be more than compensated by its more favourable direction with respect to the ship's keel.
Síđa 611 - 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?
Síđa 682 - 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...
Síđa 678 - ... 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...
Síđa 375 - ... between this meteor and magnetism. This should farther incite us to observe the circumstance formerly mentioned^ viz. that the south end of the dipping needle points to that part of the heavens where the rays of the aurora appear to converge. We wish that this were diligently observed in places which have very different variation and dip of the mariner's needle. For the diurnal and this irregular variation, consult the Dissertations of Celsius and of Hiorter, in the Memoirs of Stockholm; Wargentin,...

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