Calendar: 1883-1884 Page 664

r ο VPPLIED scikxces Λ sample of bleaching powder mixed with potassium iodide and sulphuric acid liberated 127 parts by weight of iodine for every ten parts of bleaching powder employed State the percentage of chlorine contained in the bleaching powder Sulphur was boiled with nitric acid till it was entirely converted into sulphuric acid 500 grains of lead oxide PbO were added and the whole of the nitric acid wan expelled by heat leaving mixture of lead oxide and lead sulphate which weighed 580 grains What was the weight of sulphur employed in the experiment fHrtallttrgn Contrast with one another the various fuels both solid and gaseous in respect to their calorific power and their Calorific intensity on combustion and account for the difference Enumerate the different points to which attention should he especially directed in the construction of coke ovens What is the composition of the gas which comes off at the top of blastfurnace For what purposes is this gas now utilised What do you understand the terms basic י and י acid' to mean as applied to materials employed in furnace work What do you understand by the terms 'atomic weight and 4specific gravity' Explain why different specimens of the same metal have not exactly the same specific gravity Why are some iron ores calcined preparatory to smelting What considerations determine the pressure of the blast in the making of pig iron What is the effect of phosphorus on cast iron wrought and steel respectively In casting how are metals affected by varying the rate of cooling What are the effects of annealing and of tempering