CH. IV] 



DO AND DO NOT WITH THE LIME LIGHT 



117 



186. Summary of Chapter IV: 



Do 



1. Use gas cylinders which 

 are plainly marked Oxygen 

 and Hydrogen, and have right- 

 handed screws for the oxygen 

 and left-handed screws for the 

 hydrogen ( 154). Be sure that 

 there is plenty of gas in each 



( 156)- 



2 . Connect the cylinders with 

 the burner by means of rubber 

 or metallic tubing, colored to 

 correspond with the cylinders 

 (OorH) ( 154, 159, i5 9 a). 



3. In starting the burner, 

 turn on the hydrogen or its 

 substitute first and light it, 

 then turn on the oxygen slowly 

 ( 160). 



4. Heat up the lime slowly by 

 having it at some distance from 

 the flame ( 162). 



5. Turn the lime occasionally 

 so that the pit will not get too 

 deep ( 164). 



6. In putting out the lamp, 

 turn off the oxygen first, then 

 the hydrogen after a moment. 



7. If the light snaps out, turn 

 off the oxygen then the hydro- 

 gen. Turn on the hydrogen, 

 light it and then turn on the 

 oxygen slowly as in (3). 



Do NOT 



i. Do not use gas cylinders 

 which are not plainly marked. 

 Do not start an exhibition 

 unless there is plenty of gas. 



2. Do not be careless in con- 

 necting the cylinders with the 

 gas burner. 



3 . Do not turn on the oxygen 

 first. Oxygen is last on, first off. 



4. Do not turn the full heat 

 of the O-H flame against a cold 

 lime which is close up to it. 



5. Do not let the lime stay 

 too long in one position. Ro- 

 tate it occasionally. 



6. Do not turn off the hydro- 

 gen first, but turn off the 

 oxygen first. Oxygen is on last, 

 off first. 



7. Do not leave the gases 

 turned on if the light snaps out. 

 Oxygen off first, then Hydrogen. 



