Calendar: 1871-1872 Page 538

538 applied sciences ttroStatics JPnrumatici ani Scat FIRST YEAR Explain why it is that by blowing down the tube of hydrostatic bellows man is able to lift his own weight Prove that the difference of pressure at any two points in liquid gpz where ρ is the density and ζ the difference of level between the two points If lib is the unit of weight and foot and second the units of space and time what is the density of distilled water and how would you define the unit of density Find the whole pressure on an area in the form of an equilateral triangle immersed in water with one side in the surface of the liquid Also find the position of the centre of pressure Explain how to compare the specific gravities of two liquids by weighing the same body in both liquids body weighs oz in air 617 oz in olive oil and 5948 oz in sea-water compare the specific gravities of olive oil and sea-water State Boyle's law for the pressure of gases and explain how to prove it for pressures less than the pressure of the atmosphere In barometer tube when the mercury stands at 30 inches inches of the tube remain unfilled when mass of air which at the density of the atmosphere would fill inch of the tube is admitted into the upper portion the column of mercury is depressed inches compare the areas of the tube and the cistern Explain the action of Hawksbee's Air-pumD and if the volume of the receiver is times that of one barrel find the pressure of the air in the receiver after three strokes the barometer standing at 30 inches Describe Ferguson's Pyrometer and show how the expan- sion of different substances may be compared by means of it Define latent heat Explain how to find the latent heat of steam