Ii6 TROUBLES WITH THE LIME LIGHT [Cn. IV 



holder and a new one put in place. This should then be grad- 

 ually warmed ( 162). 



SPECIAL PRECAUTIONS IN USING THE LIME LIGHT 



185. Remember that hydrogen and all the substitutes used 

 for it, illuminating gas, ether and gasoline, are very inflammable. 



Oxygen with hydrogen and also with the other substances forms 

 an explosive compound. Hence, the greatest care must be taken 

 to avoid mixing these gases except in the mixer of the burner 

 (fig. 59). Hence also in filling any part of the apparatus and in 

 working about it there should be no open flames or glowing parts 

 to ignite any accidentally escaping hydrogen, gasoline, ether, etc. 

 Fill the apparatus by daylight, or use an electric light or an elec- 

 tric flash-light if the work must be done in a dark place. In this 

 way no chance for igniting the gases will occur. Naturally one 

 should not smoke when filling the apparatus. 



It is economical to buy the best apparatus throughout. The 

 makers adapt the burners and all other parts to give the best 

 results in the safest manner, therefore, unless one is an expert in 

 such matters it is safer to take the outfit assembled and recom- 

 mended by some reliable manufacturer. 



The makers send out with their apparatus very precise directions 

 for using it with safety, and it is the height of wisdom to follow 

 their directions faithfully. 



