Calendar: 1893-1894 Page 850

CXXV111 FACULTY OF SCIENCE to that of the fluid displaced wire 56 cm in length weighs 108 gm in vacuo and 64 gm in water what is its volume and what its diameter Nicholson's hydrometer is used as follows -2586 gm is placed on the upper cup fragment of metal is placed on the cup and it is found necessary to take off 7425 gm to make the instrument float at the same level the metal is then placed in the lower cup and 1Ό15 gm added above to restore the former level Find the specific gravity of the metal Explain how to set about determining the atmospheric pressure by means of the Magdeburg hemispheres Assum- ing the radius of the sphere to be inches and that three- fourths of the air has been removed also that the barometer is 29 inches determine the pull which must be used on each hemisphere in order to separate them Describe apparatus for proving Boyle's law for pressures less than that of the atmosphere illustrating your remarks by numerical examples glass tube metre in length and open at both ends is plunged into deep cistern of mercury until length of 90 cm is submerged The top is now closed by the finger and the tube is raised until length of 90 cm stands out of the mercury If the baro- metric height at the time is 75 cm at what height will the mercury stand inside the tube Describe and explain the action of Bramah's press Show how to determine the mechanical advantage of the machine Explain the action of the air-pump with single barrel Why does it become more difficult to work the pump as the density of the air in the receiver becomes less How did Hawksbee get over the difficulty Describe the siphon gauge and the barometer gauge Assuming that the air in the receiver of an air-pump has been diminished by two-thirds of its original amount and that the height of the barometer is 76 cm determine the height of the mercury in barometer gauge attached to the receiver