Philosophical MagazineTaylor & Francis., 1919 - Physics |
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Common terms and phrases
acetic acid amplitude angle atomic axis Bessel function bulb calculated capacity centimetres chemical circuits clean colour components composite surface condenser connexion constant coordinates corresponding curve D₁ deflexions determined disk displacement distance electric electron electroscope elliptic integrals equation fact filament film fluid force formula frequency function galvanometer give given glass gramme increase inductance integral invisible film layer Lecher wires length light limit lines Lord Rayleigh's lubricant luminosity magnetic magneto measured method molecules negative normal observed obtained oscillations paper peak potential persistence of vision Phil plane plate positive radius resonance responders sequent shown sinē solution spectrum sphere gap spherical polar coordinates static friction steady sparking potential surface energy temperature theory thickness time-lag triethylamine tube vapour vector vibrations violet volts watch-glass wave-length waves
Popular passages
Page 543 - The probability is then the limit of the ratio of the number of favourable cases to the number of all cases.
Page 520 - OY the focus is at r cos (99 — 26'), r sin (<p — 20'), or r, 6.20' ; so that to a first-order approximation, whatever the fields, so long as the position of the diaphragm is fixed, the foci will all lie on the straight line ZF drawn through Z parallel to OX. For purposes of construction G the image of Z in OY is a convenient reference point, <p being here equal to 40'.
Page 143 - Density is the logarithm of the opacity, and since, in a theoretically perfect negative, opacities are directly proportional to the intensities of the light which produced them, it follows that each density must be proportional to the logarithm of the light intensity which produced it...
Page 532 - The very fine slits used in this apparatus were made with comparative ease as follows: — A cylinder of pure aluminium about 10 mm. long by 5 mm. wide is carefully bored with a hole 1 mm. diameter. The resulting thick-walled tube is then cleaned and crushed with a hammer on an anvil until the circular hole becomes a slit about '3 mm. wide. Continuation of this treatment would result in a slit as fine as required giving the maximum resistance to the passage of gas, but its great depth would make...
Page 555 - Flanking this plateau on the south and south-east, and extending thence over the southern part of the great valley to the Cross River, is a series of Eocene estuarine shales, clays, and marls, with septarian nodules and pieces of coal and resin, and a rich fauna consisting principally of mollusca, but including fragmentary remains of whales, birds, fishes, and turtles.
Page 237 - ... and measuring the gases, using the apparatus described above. A comparison of the results obtained by the different methods is given in Table 4. The area of the surface of the bubble was calculated from the measurements of its length when at rest and in motion and the known internal diameter of the tube. The volume of the bubble was 15 cc Its length when in motion was 16*04 cm., and when at rest 13*30 cm.
Page 187 - The results are given in the following table, in which the first column gives the steady sparking potential, the second the actual sparking potential, the last the excess of the latter over the former.
Page 36 - ... which obtains on the average in the interior. The inwardly directed attractive force along the normal to the surface will orientate the molecules there. The surface film must therefore have a characteristic molecular architecture, and the condition of minimal potential involves two terms, one relating to the variation in density, the other to the orientation of the fields of force...
Page 230 - ... that the rate at which water, when deprived of its usual air-content, dissolves and absorbs the gases of the atmosphere, is a problem which involves so many variable factors that its determination experimentally is by no means so simple a matter as might at first appear. Amongst the factors referred to are — the humidity of the air and the initial air-content, salinity, temperature, and depth of the water. Some of these factors had, to some extent at least, already been...
Page 408 - Ltd., 1948. (Pp. xii + 310, with 74 figures and 27 tables.) 30s. net. Tables of Physical and Chemical Constants and some Mathematical Functions. By GWC Kaye, OBE, MA, D.Sc...