Calendar: 1855-1856 Page 379

APPLIED SCIENCES 375 Give any proofs that occur to you of the weight and pressure of the air Explain the action of the Air-pump When is solution said to be saturated Explain the dif- ference between solution and chemical combination-giving illustrations of both What is the principle upon which the Thermometer is graduated How do you prove that heat becomes latent In what way are differences of Specific Heat ascertained Explain the principle and construction of the Cryophorus Explain the process of charging Leyden jar What is the analogy between the discharge of lightning from thundercloud and the discharge of Leyden battery How should lightning-rods be constructed to render them efficient Describe the construction and action of the Electrophorus IV -CJjcmfetrn What are the impurities commonly met with in spring water State how they are usually detected What is the method of obtaining Sulphuric Acid on the large scale Describe its properties Mention the principle oxides of Chlorine Describe the mode of preparing the two which contain the largest proportion of Oxygen Give the properties of each What compounds does Fluorine form with Silicon Ho is Hydrofluoric Acid prepared Explain its action upon Glass and state the decomposition which the gaseous compound which is thus obtained experiences when dissolved in water Describe the preparation of the soluble salts of Baryta from the Sulphate How are the salts of Baryta distinguished from those of Strontia and Lime β How is Cast Iron converted with Bar Iron What are the principal oxides of Iron How are the compounds of these oxides recognised Describe the mode of obtaining Mercury from its ore How are Calomel and Corrosive Sublimate obtained