Calendar: 1876-1877 Page 555

CL0THW0KKER8' SCIENCE EXHIBITION 555 which will illustrate what you state To what extent do jour distinctions and divisions hold good What is meant by the term specific gravity specific gravity flask weighs grammes when empty and when filled with water 20 grammes 16 grammes of certain powder are put into the flask which is then filled up with water and found to weigh 24 grammes determine the specific gravity of the powder Describe the construction of the cistern barometer giving as full an account as you can of the precautions necessary to secure both an accurate instrument and correct reading given quantity of air occupies different volumes under different pressures what is the law connecting the volumes and the corresponding pressures assuming the tempera ure to remain unchanged Describe an experiment for proving this law for pressure greater than 15 lbs per square inch Describe an exact method of determining the co-efficient of expansion of metal bar bar of iron ft long at zero is heated to I80 find its length the coefficient of linear expansion of iron for being 0000122 10 Define specific heat If the specific heat of mercury be 033 what will be the temperature of mixture of lbs of mercury at 100 with lbs of water at 16 11 Explain the meaning of the term mechanical equivalent of heat Describe Joule's experiments for determining the mechanical equivalent of heat and give the result arrived 12 The rapidity with which sound passes through air at an elevation equal to that of Mont Blanc is less than its rapidity at the sea level explain the cause and state generally the con- ditions which influence the velocity of sound in air and other bodies 13 Explain how beats are produced Two tuning-forks of the same temperature vibrate at the same rate one of them is then heated What effects will now be produced when the forks are sounded together Give fully the reasons for your answers 14 Describe the best method with which you are acquainted for determining the velocity of light