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angle angle of incidence apparatus Argand Argand burner asked John asked Lawrence beam boatswain's pipe bright light Bude Light burning called camera obscura candle centre CHAPTER colors combination combustion coming continued Lawrence contrivance convex lens course curious direction distance diverge effect electricity emit engraving enter the eye experiment explained fire flame flected Flippy force ghost glass heat hydrogen illuminated illusion incandescent intensity kind lamp LAMP-BLACK Lawrence and John LENOX AND TILDEN lens light-houses lines look luminous magnesium manner means mirror modes object observed oxygen oxyhydrogen particles of carbon pass pier portion principle produced radiation rays of light reflected reflectors REFRACTION rence replied John replied Lawrence retina river screen seen sensation sense shining side solid particles sometimes sphere square steamer supply of oxygen surface thing TILDEN FOUNDATIONS tion tube YORK PUBLIC LIBRARY
Popular passages
Page 97 - This latter line intersects the sphere in the point, c ; and as the light is reflected from any surface in the direction of the visual rays, so as to make the angle of incidence equal to the angle of reflection, if we divide the angle...
Page 193 - If you hold a glass of water with a spoon in it a little above the level of the eye, and look upwards at the under surface of the water, you will find that you are unable to see that part of the spoon which is above the water.
Page 287 - ... of being accumulated by selection till they present very large and important divergencies from the ancestral stock. We thus see, that the evidence as to variation afforded by animals and plants under domestication strikingly accords with that which we have proved to exist in a state of nature. And it is not at all surprising that it should be so, since all the species were in a state of nature when first domesticated or cultivated by man, and whatever variations occur must be due to purely natural...
Page 89 - The angle of incidence is equal to the angle of reflection. This is one of the fundamental laws of optics.
Page 249 - Change in the direction of a ray of light passing from one transparent medium into another of a different density.
Page 266 - Lawrence said that the midday observation was for the latitude only, which they determined by the altitude of the sun at noon. The altitude of the sun...
Page 246 - B, which, after reflection, must go to the point b, making the angle of reflection equal to the angle of incidence. If...
Page 54 - ... the intensity at any point is inversely as the square of the distance from the centre.
Page 32 - ... which it is seen to occur by an observer on the earth when the earth is on opposite sides of its orbit.
Page 25 - Exactly how we are to picture this diminution of intensity to our minds it is difficult to say, but it is certain that it is not...