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The Problem of the Random Walk
THIS problem, proposed by Prof. Karl Pearson in the current number of NATURE, is the same as that of the composition of n iso-periodic vibrations of unit amplitude and of phases distributed atExpand
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The Explanation of Certain Acoustical Phenomena
MUSICAL sounds have their origin in the vibrations of material systems. In many case, e.g. the pianoforte, the vibrations are free, and are then necessarily of short duration. In other cases, e.g.Expand
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On the Magnetic Rotation of Light and the Second Law of Thermo-Dynamics
IN a paper published sixteen years ago I drew attention to a peculiarity of the magnetic rotation of the plane of polarisation arising from the circumstance that the rotation is in the same absoluteExpand
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The Soaring of Birds
THE recent correspondence in NATURE upon this subject ought not to close without some reference to a possible explanation of soariiig which does not appear to have been yet suggested.
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Pebbles of Regular Shape, and Their Reproduction in Experiment
MOST pebbles are of irregular shape; for example, in the glacial beds of flint pebbles near my home in Essex, at the most two per cent have any symmetry, and the presumption is that the largeExpand
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The Principle of Similitude
It is rather curious that Prof, D'Arcy Thompson should refer to Tait's "Properties of Matter,” for I fancy I might claim some part of the credit for the paragraph in question. Expand
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IN the reaction against the arbitrariness of prismatic spectra there seems to be danger that the claim to ascendency of the so-called diffraction spectrum may be overrated. On this system the raysExpand
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Experiments in Aërodynamics
THE subject of this memoir is of especial interest at the present time, when the skill of a distinguished inventor is understood to be engaged in attacking the many practical difficulties which lieExpand
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Luminous Phenomena in Oxygen
PROF. J. KAPLAN1 proposes the name ‘active oxygen’ for certain luminous phenomena observed by him “just as the name active nitrogen was given to similar phenomena in nitrogen”. I write to point outExpand
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Surface Tension
I SHALL be obliged if you can find space for the accompanying translation of an interesting letter which I have received from a German lady, who with very homely appliances has arrived at valuableExpand
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