Reproduced by permission of Price's Patent Candle Co.. Ltd. 



CANDLE MOULDING 



One of the many products of Scotch shale is paraffin oil. Out of crude paraffin oil the candle factories freeze the solid paraffin that is 

 largely used in making candles. Coloured candles are made from fats stained with aniline dyes. 



The illustration shows candle moulding on a large scale. The melted material is poured into moulds. When the moulds are full 

 the hot water with which they are surrounded is replaced by cold water, thus causing the candles to solidify. 



Photo: L. E. A. 



Old. 



DAVY LAMP 



New. 



The safety-lamp was invented by Sir Humphry Davy to 

 prevent explosions from fire-damp in mines. The presence of 

 explosive gas is indicated by the burning of the fire-damp in the 

 interior of the gauze cylinder, the heat is conducted away, and 

 prevents the flame from spreading to the gas in the mine. 



