A text-book on physics: Being a short and complete course based upon the larger work of Ganot, for the use of academies, high school, etc

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...heat in the summer than in the winter. 35. Why, in digging wells, the heat inoreases with the depth. 36. Why burning carburetted hydrogen (carbon and hydrogen) gives out more light than pure hydrogen. 37. Why exercise increases the heat of the animal system. 38. Why water boils more rapidly in a metallic than in a porcelain vessel. 39. Why carpeted floors are warmer then bare floors. 40. Why double windows effectually protect a building from cold. 41. Why two garments are warmer than a single one of the same material and of a thickness equal to the two together. 42. Why window panes do not exclude the solar heat, while they confine the heat of the room. 4o. Why a goo'l fire-screen can be made of glass. 44. Why black clothes should not be worn in the summer. 45. Why the fireirons are made of polished metal. 46. Why tea-pots are made of polished metal. 47. Why the air feels particularly chilly during a thaw. 48. Why a moist atmosphere is oppressive in hot weather, and raw and chilly in cold weather. 49. Why ice is preserved from melting by being wrapped in flannel. 50. Why a pitcher of cold water sweats in hot weather. 51. Why water, in a heated atmosphere, may be cooled by wrapping around the pitcher a wet cloth. 52. Why water boils more quickly in a vacuum than when exposed to the air. 53. Why the continued application of heat to melting ice does not raise its temperature. 54. In what way the application of a cold liquid may be made to produce the phenomenon of ebullition. CHAPTER VII. LIGHT. I.--ORIGIN, TRANSMISSION, AND INTENSITY OF LIGHT. 227. Light is the agent which, by its action on the eye, excites in us the sensation of vision. That part of physics which explains the properties of light is called optics. 228. The two most noted theories advanced to ...