Calendar: 1882-1883 Page 695

692 WARNEFORD SCHOLARSHIPS What are Magdeburg hemispheres and what are they intended to show If the air is half exhausted from pair of hemispheres and these are taken in this condition 17 feet below the surface of water what force would be required to separate them at this depth supposing the radius of the sphere formed to be inches State fully the weighings which would have to be made in ascertaining the specific gravity of sand by means of flask and give formula to express the specific gravity in terms of these weighings Describe the common single-barrel air-pump and show why it is impossible to produce perfect exhaustion with such an instrument Enunciate Boyle's law Suppose that you have cylinder open at the top and closed at the bottom and piston working freely but air-tight in the cylinder and that when there is no pressure on the piston but that of the atmosphere the piston is 12 inches from the bottom of the cylinder compare the forces which you would have to exert to force the piston down inches and to pull it up inches State the manner in which heat generally affects the size of bodies and point out any exceptions to the general rule bottle is filled with air under the atmospheric pressure equal to 760 millimetres of mercury and at the tempera- ture of 20 the bottle is then securely stopped and the temperature reduced to find what will now be the pressure of the air Describe Daniell's hygrometer and explain how it is used for determining dew-point What is latent heat 50 grammes of steam at 100 are passed into vessel containing 50 grammes of ice at and 400 grammes of water at the same temperature find the resulting temperature