CH. IV] 



MANAGEMENT OF THE LIME LIGHT 



109 



warmed up the lime is not liable to break. Some operators warm 

 the lime by means of the hydrogen flame only. When the lime is 

 warm the oxygen is turned on slowly until the most brilliant light 

 is obtained. 



163. Arranging the lime and the burner ; rotating the lime. 



After warming the lime for half a minute or so it should be grad- 

 ually brought toward the nozzle until it is only about 5 mm. (% 

 inch) distant. If now one watches the disc of light on the screen 

 and slowly moves the lime slightly closer to and farther from the 

 tip of the nozzle it is easy to tell when one gets the most light. It 

 is to be remembered that the best light is not practically instan- 

 taneous, as with the arc lamp, but is produced after the lime has 

 been half a minute or so in one position. 



164. Changing the position of the lime. The intense heat of 

 the oxy-hydrogen jet makes a little pit in the surface of the lime. 

 In about two minutes this pit gets so deep that the light is greatly 



FIG. 61. GLOVES WITH ASBESTOS PATCHES ON THE THUMB, INDEX AND 

 MIDDLE FINGERS FOR USE IN WORKING ABOUT THE HOT LIME- 

 LIGHT LANTERN. 



Right hand, palm up: p, Pollex or thumb; i, Index or fore finger; m, 

 Medius or middle finger; c, the index and medius used as pincers to grasp a 

 hot lime or a hot carbon. 



Left hand, palm up: i, 2, j The first, second and third digits, but num- 

 bered instead of named. 



