itions under which the rainbow appears,Chaussures New Balance Cross Country. So it is clear that the rainbow is a reflection of sight to the sun,Chaussures Nike TN Femme.
So the rainbow always appears opposite the sun whereas the halo is round it. They are both reflections, but the rainbow is distinguished by the variety of its colours. The reflection in the one case is from water which is dark and from a distance; in the other from air which is nearer and lighter in colour. White light through a dark medium or on a dark surface (it makes no difference) looks red. We know how red the flame of green wood is: this is because so much smoke is mixed with the bright white firelight: so,Chaussures Gazelle Femme, too, the sun appears red through smoke and mist. That is why in the rainbow reflection the outer circumference is red (the reflection being from small particles of water), but not in the case of the halo. The other colours shall be explained later. Again,Challenge Yd, a condensation of this kind cannot persist in the neighbourhood of the sun: it must either turn to rain or be dissolved, but opposite to the sun there is an interval during which the water is formed. If there were not this distinction haloes would be coloured like the rainbow. Actually no complete or circular halo presents this colour,Rc Lens Pas Cher, only small and fragmentary appearances called ‘rods’. But if a haze due to water or any other dark substance formed there we should have had,Air Jordan Retro 10 Damskie, as we maintain,Menn Moncler Reynold, a complete rainbow like that which we do find lamps. A rainbow appears round these in winter, generally with southerly winds. Persons whose eyes are moist see it most clearly because their sight is weak and easily reflected. It is due to the moistness of the air and the soot which the flame gives off and which mixes with the air and makes it a mirror, and to the blackness which that mirror derives from the smoky nature of the soot. The light of the lamp appears as a circle which is not white but purple. It shows the colours of the rainbow; but because the sight that is reflected is too weak and the mirror too dark, red is absent. The rainbow that is seen when oars are raised out of the sea involves the same relative positions as that in the sky, but its colour is more like that round the lamps,Kobiety Barbour Waxed Kurtka, being purple rather than red. The reflection is from very small particles continuous with one another, and in this case the particles are fully formed water. We get a rainbow, too, if a man sprinkles fine drops in a room turned to the sun so that the sun is shining in part of the room and throwing a shadow in the rest. Then if one man sprinkles in the room,Menn Moncler Berriat, another,luxury boulder, standing outside,Kobiety Barbour International Kurtka, sees a rainbow where the sun’s rays cease and make the shadow. Its nature and colour is like that from the oars and its cause is the same, for the sprinkling hand corresponds to the oar.
That the colours of the rainbow are those we described and how the other colours come to appear in it will be clear from the following considerations. We must recognize,Parajumpers Herreklær Jakke, as we have said, and lay down: first, that white colour on a black surface or seen through a black medium gives red; second, that sig
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