Calendar: 1870-1871 Page 533

APPLIED SCIENCES 533 Find the pressure on rectangular surface immersed in liquid of specific gravity and having one of its edges parallel to the surface of the liquid The water in canal lock rises 17 feet upon the gate and the breadth of the gate is 25 feet find the pressure upon the gate The weight of cubic foot of water is 625 lbs tube open at each end is partially filled with mercury and water is then poured into one leg what relation exists between the levels of the liquids in the two legs If the mercury stands half-way up the legs of the before the water is put in and if one leg be filled to the top with water find the height of the mercury in tbe other and are the respective volumes of the cylinder and receiver of condensing syringe find the density of the air in the latter after η strokes What is meant by the Dew Point How may it be ascer- tained directly and indirectly Define specific heat If the specific heat of mercury be 0033 what will be the temperature of mixture of 51bs of mer- cury at 100 with 51bs of water at 16 Describe an exact method of determining the coefficient of expansion of metal bar bar of iron 10 feet long at zero is heated to 80 find its length the coefficient of expansion of iron being 0-0000122 What is meant by the absolute and the apparent expansion of liquid Knowing that the coefficient of absolute expansion of mercury is -550ו and its coefficient of apparent expansion in particular kind of glass is aJ8U find the coefficient of cubical expansion of glass 10 How did Hope show that water has point of maximum ensity Itctrtttty ants fMacjtuttsim SECOND AND THIRD YEARS Describe Coulomb's torsion balance How did he apply it to prove that the attractive or repulsive force of two magnetic poles varies inversely as the square of the distance