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Original Papers by the Late John Hopkinson

 By John Hopkinson, Bertram Hopkinson


dielectric, Florence flask, LEYDEN JAR
LEYDEN JAR, electrometer, electromotive force
ebonite, flint glass, ELECTROSTATIC
Neatsfoot oil, millimetre, induction balance
refractive index, inductor, volts
dielectric constant, potential difference, double refraction
colza oil, Xylol, induction coil
microfarad, galvanometer, Ruhmkorff coil
galvanometer, manganese, magnetising force
asbestos, Magnetising Force, IMPURE NICKEL
critical temperature, Joseph Whitworth, virgin steel
non-magnetisable, electric resistance, Nickel
hysteresis, nickel, alloys
MAGNETIC VISCOSITY, soft iron, hard steel
hysteresis, self-induction, MAGNETIC VISCOSITY
centim, amperes, force H
vis viva, wire, 56 at bottom
cjcm, angular velocity, differential equation
titanic acid, rutile, silicic glasses
Leyden Jar, principle of superposition, pulley
temperature of whole, dx dy dz, unequal heating
dU du du, isothermal, independent variables
Peltier effect, anode, Ohm's law
electrolyte, coulombs, hydrogen

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ONE of the deductions from Maxwell's electromagnetic theory of light is, that the specific inductive capacity of a medium is equal to the square of its refractive index. Another deduction is, that a body which is opaque to light, or, more generally, to radiant energy, should be a conductor of electricity. The first deduction appeared so clear an issue that many experimenters have put it to the test. The results may be briefly summarized thus: — Some bodies (such, for example, as hydrocarbon oils*... - Page 86

As the material was given to me it was non-magnetisable at ordinary temperature; that is to say, the permeability was small, about 1'4, and the induction was precisely proportional to the magnetising force. The ring on being heated remained non-magnetisable up to 700° C. or 800° C. A block of the material did not recalesce on being heated to a high temperature and being allowed to cool. On being placed in a freezing mixture, the material became magnetic at a temperature a little below freezing... - Page 233

Considering the current and T as vectors, the part of the electromotive force due to T is the vector part of the product T x current. "The coefficient T may be called the rotatory coefficient. We have reason to believe that it does not exist in any known substance. It should be found, if anywhere, in magnets which have a polarization in one direction, probably due to a rotational phenomenon in the substance." Does not the " rotatory coefficient " of resistance completely express the important facts... - Page 374

When 0=1439 and y=-676, it was found that 0= +676 ; the calculated value is 688. A further experiment of verification, involving only the capacity of the quadrant, is the following. The quadrant A being connected to the case, B was charged by contact instantaneously made and broken with a battery of known potential, and the resulting deflection was noted. The instantaneous contact being made by hand, no very great accuracy could be expected. Let... - Page 101

D is the more refrangible of the pair of sodium lines, b is the most refrangible of the group of magnesium lines, (G) is the hydrogen line near G. The method of smoothing the results by the aid of each other has been, first, to calculate a, b, and c from the mean values of fj. - Page 46

... of 6-7. There can be no question about the accuracy of the observed refractive indices ; and I have myself no doubt about the specific inductive capacity; but formulae of extrapolation are always dangerous when used far from the actual observations. If Maxwell's theory is true, light flint-glass should be perfectly transparent to radiations having a wave-period of, let us... - Page 87

That if any physical cause increase the tenacity of of wire, but increase the product of its elasticity and linear density in a more than duplicate ratio, it will render it more liable to break under a blow. 2nd. That the breaking of wire under a blow depends intimately on the length of the wire, its support, and the method of applying the blow. 3rd. That in cases such as surges on chains, etc., the effect depends more on the velocity than on the momentum or vis viva of the surge. 4th. That it is... - Page 320

Phosphatic glasses are too soft for convenient employment in optical instruments ; but should titano-silicic glasses prove to be to silicic what titano-phosphatic glasses had been found to be to phosphatic, it would be possible, without encountering any extravagant curvatures, to construct perfectly achromatic combinations out of glasses having the hardness and permanence of silicic glasses ; in fact the chief obstacle at present existing to the perfection of the achromatic telescope would be removed,... - Page 341

... when the posts by which contact with the quadrants is made are down and in contact with the quadrants, and when they are raised up out of contact; the former are denoted by qn + a and q^ + a, the latter by qu and q^, the capacity of the binding-posts being a. - Page 98

... water. A quantity of the wire was brought into the non-magnetisable state by heating it and allowing it to cool. The electric resistance of a portion of this wire, about 5 metres in length, was ascertained in terms of the temperature; it was first of all tried at the ordinary temperature, and then at temperatures np to 340° C. - Page 235

References from web pages

Hopkinson bar experimental technique: A critical review—[Applied ...
A critical review of three classic papers by B Hopkinson, RM Davies, and H Kolsky, and the state-of-the-art in Hopkinson bar experimental techniques is ... link/ ?AMREAD/ 57/ 223/ 1

Internet Archive Search: subject:"magnetic"
Original papers by the late John Hopkinson (Volume 2) - Hopkinson, John, 1849-1898 v. 1. Technical papers.--v. 2. Scientific papers ... search.php?query=subject%3A%22magnetic%22

Technik - Gesammelte Schriften einzelner Personen - Bibscout
Madrid : Fundación Banco Exterior, 1992 Details; Original papers by the late John Hopkinson / ed. with a memoir by John Hopkinson ; 2 ... bibscout/ ZG-ZS/ ZN/ ZN.2200

Other editions

Original Papers by the Late John Hopkinson

Original Papers by the Late John Hopkinson

by John Hopkinson, Bertram Hopkinson - Electricity - 1901
Original Papers by the Late John Hopkinson

Original Papers by the Late John Hopkinson

by John Hopkinson, Bertram Hopkinson - Electricity - 1901
Original Papers by the Late John Hopkinson

Original Papers by the Late John Hopkinson

by John Hopkinson, Bertram Hopkinson - Electricity - 1901