Calendar: 1873-1874 Page 562

562 APPLIED SCIENCES Cijcmistrg Point out the chemical changes which take place luring the combustion of coal and explain the formation of soot Describe the process by which phosphorus is commonly obtained Explain it by equations How is the strength of solutions of acids and alkalies most quickly ascertained for commercial purposes Describe the method of proceeding Write the chemical formulae for hydrochloric acid hydro- sulphuric acid nitric acid sulphuric acid caustic potash and ammonia What is implied by the statement that chlorine is mona- tomic oxygen diatomic nitrogen triatomic and carbon tetra- tomic How would you ascertain whether given powder is white arsenic State the composition of that substance Manufacturing Hrt antJ 4ΐ1αφ'ηη χ SECOND PEAR Sketch the cylinder and'ram inches diameter inches stroke of hydraulic-press Explain the construction and action of the leather packing and give the greatest pressure per circular inch to which the machine is capable of being worked in practice Explain the construction and action of the differential safety- valve in the hydraulic-press pump and state the objections to the ordinary conical valve Explain the action and use of the stand pipe and of the air vessel in the pumping machinery at the Battersea Waterworks Sketch and describe Poncelet's undershot water-wheel Under what circumstances is the undershot wheel to be preferred to the high breast or overshot wheel What is the usual velocity of the periphery of overshot and high breast wheels and how is this determined Give an outline description of the beam engines used for