Calendar: 1890-1891 Page 769

ENGINEERING DEPARTMENT cvii in area is filled half with mercury density 136 and half with water find the pressure on one of its sides Distinguish between density and specific gravity sinker weighing 38 grammes is fastened to piece of cork weighing 10 grammes and the two together just sink when placed in water find the density of the sinker taking that of the cork as 025 cylindrical piece of cork of height 10 centimetres is floating vertically in basin of water If the basin be placed under the receiver of an air-pump and the air be pumped out find how far the cork will sink The density of ordinary air is 0013 of the cork is 25 and of the water Describe an experimental method of proving Boyle's law for pressures greater for pressures less than that of the atmosphere Explain how you would proceed to determine the pressure of the atmosphere by means of the Magdeburg hemispheres cylindrical tube metre in length and having one end sealed contains dry air The tube is dipped vertically with its open end downwards into tank of mercury till the air within it is compressed to three-fourths of its former volume find the distance of the top of the tube from the surface of the mercury in the tank the height of the barometer being 750 millimetres Describe the barometer gauge and the siphon gauge illustrating by examples the mode of using these instruments for determining the degree of rarefaction produced by an air- pump Explain the principle of the common suction-pump and show how to calculate the force which must be brought to bear on the piston rod when the pump is in full action Find the force required to sustain the piston without friction if the radius of the piston be 14 cm the depth from it to the surface of the water in the well 400 cm and the height of the column of water above it 60 cm Describe the condensing syringe Air is forced into 302