Calendar: 1884-1885 Page 662

656 APPLIED SCIENCES The apparent mass in air of piece of cobalt was 5825 grammes specific gravity flask when filled with water at 16 had an apparent mass of 72 684 grammes whilst the mass of the flask when filled with water after the cobalt was put into the flask was 74 074 grammes determine the true density of the cobalt assuming the density of water at 16 to be '999 and the mass of cubic centimetre of the air of the room to be 0012 grammes Describe the construction of the ordinary barometer and indicate the nature of the corrections which should be applied in order to secure correct reading Give an account of an experimental method of proving Boyle's law for pressures greater than for pressures less than that of the atmosphere illustrating your remarks by numerical examples gas initially at volume 5000 cubic centimetres tempera- ture 10 and pressure represented by 75 centimetres of mercury has its pressure increased to 76 centimetres of mer- cury and its temperature raised to 200 Find its final volume Define hygrometric state י of the air and illustrate by an example the mode of determining the hygrometric state י of the air by means of DanielFs hygrometer Mention the various sources of error to which the last-named instrument is subject Describe Regnault's apparatus for determining the specific heat of solids Lead melts at 326 Its latent heat is its specific heat is 0314 in the solid state and 0402 in the liquid state Determine the rise of temperature which will be produced by dropping into 100 grammes of water at 100 grammes of melted lead at 360 What is meant by the statement-the mechanical equiva- lent of heat is 772 foot-pounds By what number would the mechanical equivalent be expressed if the gramme the centi- metre and be the units of force length and temperature With what velocity in centimetres per second must leaden bullet strike target that its temperature may be raised to