Calendar: 1874-1875 Page 574

574 APPLIED SCIENCES FIRST YEAR IV -SjjUroatattts anil rat Explain what is meant by tbe pressure of fluid at any point and prove that the pressure at any point of fluid is the same in all directions Prove that tbe pressure on the base of vessel containing liquid is independent of tbe capacity or shape of the vessel provided that the area of the base and its depth below the free surface of the liquid are unchanged Describe Nicholson's hydrometer and show how it may be used to determine the specific gravities of solids and liquids Nicholson's hydrometer weighs 500 grammes in air when placed in water 250 grammes are required to sink the instrument to level with the mark on the stem and when placed in certain liquid 100 grammes are required to sink it to the mark also when solid body is placed in the cup 150 grammes are required to sink it to the mark in water and when the solid is placed in tbe cage 200 grammes are required find the specific gravities of the liquid and tbe solid Describe the construction of tbe cistern barometer giving full account of the precautions necessary to secure both an accurate instrument and correct reading Enunciate Boyle's law Compare the weight of 000 cubic centimetres of dry air under pressure of 760 of mercury and at temperature of 15 with the weight of 000 cubic centimetres of dry air under pressure of 500 of mercury and at temperature of 200 the coefficient of expansion of air being taken as 003665 for Describe the construction of the common mercury thermo- meter giving full account of the precautions necessary to secure good instrument Explain the meaning of the terms evaporation dew point hygrometric state Describe Daniell's hygrometer showing how to use the instrument to determine dew point What are its dis- advantages and what corrections were introduced by Regnault Describe Regnault's apparatus for determining tbe specific