Calendar: 1884-1885 Page 695

CLOTHWORKERS' SCIENCE EXHIBITION 689 Explain how it is that in drawing up bucket of water from deep well the difficulty increases slightly as the bucket ascend State the conditions necessary to secure the correctness and sensibility of the balance and explain clearly why these conditions are necessary When placed in one scale-pan of balance with unequal arms substance seemed to weigh 504 grammes whilst in the other scale-pan its apparent weight was 502 grammes determine the correct weight The two weights in Attwood's Machine are 15 and 15J grammes determine the space in centimetres and the velocity in centimetres per second when seconds have elapsed determine also the tension of the string 981 centimetres per second per second In the last question determine the value of when foot and minute are taken as units of space and time Standard gold consists of 11 parts by weight of gold mixed with part of copper taking the specific gravity of pure gold as 1926 and that of copper as 885 shew that the weight lost in water by 12000 grains of gold is theoretically 684 grains Explain the action of double-barrelled air-pump and shew how to calculate the amount of exhaustion after any number of strokes The length of the tube of barometer is 32 inches some air has got into the space above the mercury and in con- sequence the mercury stands at 29 inches when it would stand at 30 inches if the instrument was uninjured find the true height of the barometer when the injured instrument reads 28 inches The railway from London to Edinburgh is about 400 miles long the extreme variation of temperature between winter and summer is 90 find the variation in the whole length of the rails of wrought iron The coefficient of linear expansion of wrought iron for is 0000068 10 Describe Regnault's hygrometer and shew how it is used for determining the hygrometric state of the air χ χ