Calendar: 1848-1849 Page 272

270 applied sciences What is the law regulating the volume of gases and vapours under alterations of pressure Give an example of its application to the measurement of gases What is the rate of expansion by heat which gaseous bodies undergo Upon this datum calculate the bulk of 50 cubic inches of gas measured at 70 Fab and of 100 cubic inches measured at 50 Fah each corrected to the temperature of J0U Fab Define what is meant by the dewpoint Mention the mode of experiment by which it is ascertained and explain the prin- ciple of proceeding Describe the phenomena produced by the friction of glass against silk and explain them according to Dufay's hypothesis How is the gold-leaf electroscope used in ascertaining the nature of the electric excitement of charged body Trace the steps of the action Mention some of the principal natural phenomena directly traceable to electricity of high tension -CI nu1$tr1 State and exemplify the laws of chemical combination 10 What is the composition of the atmosphere Describe the method of obtaining its three permanently gaseous constituents in state of purity 11 Enumerate the non-metallic elements Give their symbols their equivalent numbers on the hydrogen scale and their combining volumes 12 Describe the method of obtaining hydrochloric acid Give in symbols the changes that occur Mention its principal properties both as gas and in solution Explain its action on hydrate of potash binoxide of manganese and red oxide of mercury 13 What is the composition of coal gas Describe the process of manufacture and the nature of the products removed in the operations of purifying it