Philosophical Transactions of the Royal Society of London, Količina 137W. Bowyer and J. Nichols for Lockyer Davis, printer to the Royal Society, 1847 |
Druge izdaje - Prikaži vse
Pogosti izrazi in povedi
action angle apparatus appears ARGELANDER ascension and declination atmosphere barometer bulb Canada balsam catalogues Cirrostratus Clear Clear Cloudless clouds coloured comparison contraction cotton wool cylinder Day and mometer deduced direction distance diurnal diurnal variation electric current electro-magnet electrodes equations experiments flax flector gases glass globules Half-cloudy heat height Helena high above grass hydrogen hypothesis ignited inches high lamp light long grass luminous arc magnet magnetometer MDCCCXLVII Mean excess mercury meridian minute nerve Number of nights observations Observatory obtained OTTO STRUVE oxide oxygen oxyhydrogen paper phenomena photogenic plate platinum platinum wire previous to reading probable error produced proper motions quantity raised board raw wool reflector remarked right ascension Royal Medals Royal Observatory Sept short grass slit stars substances sun's motion surface temperature thermometer in air thermometer placed tion tube vapour voltaic arc white tin wool on grass
Priljubljeni odlomki
Stran 258 - On the Amount of the Radiation of Heat at Night from the Earth, and from Various Bodies placed on or near the Surface of the Earth," communicated to, and read before, the Royal Society on the 4th of February 1847.
Stran 267 - Astronomical Observations made at the Naval Observatory, Washington, under orders of the Hon. Secretary of the Navy, dated August 13, 1838, by Lt.
Stran 195 - But however this may be, it is certain that vegetation in this country is liable to be affected at night from the influence of radiation by a temperature below the freezing point of water, ten months in the year ; and even in the two months, July and August, which are the only exceptions, a thermometer covered with wool will sometimes fall to 35 . It is, •however, only low vegetation upon the ground which is exposed to the full rigour of this effect.
Stran 213 - A vertical bar, moving in guides, is driven by a circular cam plate having a centre of motion in the centre line of the bar. The distance from the centre of motion to the centre of the plate is 2 inches, and the bar exerts a pressure of 10 Ibs. when rising, but falls by its own weight. Find the work done in 100 revolutions of the olate.
Stran 108 - ... it to receive a dark colour on being again washed with the usual solution, excepting those small portions upon which dark images of the lower parts of the pendulums of the electrometer are projected through the slit.
Stran 107 - In either case au abundance of light is thrown into the microscope. Between the electrometer and the ether, or eye-end of the microscope, fine achromatic lenses are placed, which have the double effect of condensing the light upon a little screen, situated at that eye-end, and of projecting a strong image of the electrometer, in deep oscuro, upon it. Through the screen a very narrow slit, of proper curvature, is cut, (the chord of the arc being in a horizontal position,) and it is fitted into the...
Stran 92 - The importance of truth and veracity will appear from the following considerations. In the first place, it is the bond of society, and the foundation of all that confidence and intercourse which subsist among rational beings. By far the greater part of all the knowledge we possess, has been derived from the testimony of others. It is from the communication of others, and from a reliance on their veracity...
Stran 250 - In this manner the sun had passed rapidly over five or six zones of the plate. Its passage was marked by long black bands, whilst the intervening spaces were white ; showing again that it was sufficient in order to destroy the action of the photogenic rays to let red rays pass rapidly over the spaces previously affected by them.
Stran 107 - ... by him in the following words : — " A rectangular box, about sixteen inches long and three square, constitutes the part usually called the body of a kind of lucernal microscope. A voltaic electrometer (properly insulated, and in communication with an atmospheric conductor) is suspended within the microscope, through an aperture in the upper side, and near to the object end. That end itself is closed by a plane of glass, when daylight is used, and by condensing lenses, when a common Argand lamp...