A Manual of Natural and Experimental Philosophy: Being the Substance of a Series of Lectures Delivered in the London, Russell, Surrey, and Metropolitan Institutions, Volume 2


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Página 107 - ... other teaches me, that every grain of sand may harbour within it the tribes and the families of a busy population. The one told me of the insignificance of the world I tread upon ; — the other redeems it from all its insignificance ; for it tells me that in the leaves of every forest, and in the flowers of every garden, and in the waters of every rivulet, there are worlds teeming with life, and numberless as are the glories of the firmament.
Página 107 - The one has suggested to me, that beyond and above all that is visible to man, there may be fields of creation which sweep immeasurably along, and carry the impress of the Almighty's hand...
Página 416 - I have seen double and treble nebulae variously arranged; large ones with small, seeming attendants ; narrow, but much extended lucid nebulae or bright dashes; some of the shape of a fan, resembling an electric brush issuing from a lucid point...
Página 16 - If he reach his hand farther, the hand of the image will pass by his hand, and come between it and his body ; and if he move his hand towards either side, the hand of the image will move towards the other ; so that, whatever way the object moves, the image will move the contrary way. A bystander will see nothing of the image, because none of the reflected rays that form it enter his eyes.
Página 381 - evidence of things not seen," in the fulness of Divine grace ; and was profound on this, the greatest concern of human life, while unable even to comprehend how the " inclination of the earth's axis to the plane of its orbit" could be the cause of the change of the seasons.
Página 323 - ... but the land and water are cooled by this operation in a very different manner : the impression of cooling on the land is limited to the surface, and very slowly transmitted to the interior ; whereas in water above...
Página 252 - ... the upper end becoming a south pole, and the lower end a north pole ; but the discharge does not produce any polarity, if the iron be placed in the plane of the magnetic equator. The effects appear to be the same, whether the discharge be made on the lower or upper end of the bar, or whether it is passed longitudinally or transversely through the iron.
Página 286 - Masses of mercury of several inches in diameter were set in motion, and made to revolve in this manner, whenever the pole of the magnet was held near the perpendicular of the wire ; but when the pole was held above the mercury between the two wires, the circular motion ceased ; and currents took place in the mercury in opposite directions, one to the right, and the other to the left of the magnet.
Página 271 - ... in the ship ; and that the errors produced by this combined attraction, were proportionate to the sines of the angles between the ship's head and the magnetic meridian. On the magnetic equator, where the dipping needle stands horizontally, or there is no dip, there seemed to be no local attraction ; but after passing some distance into the southern hemisphere, when the south end of the needle had dipped, observations again showed errors in the...
Página 326 - A common thermometer consists of a tube terminated at one end by a bulb, and closed at the other. The bulb and part of the tube are filled with a proper liquid, generally mercury, and a scale is applied, graduated into equal parts.

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