84 THE MICROSCOPE. 



ever ready for use, and affording a perfect control over 

 the flame; but when the ordinary gas-lamps are used 



Fig. 48. Gas-lamp, 8fC. 



for the purpose of illuminating the field of the micro- 

 scope, a yellow glaring light is given, alike injurious to 

 the eye and the definition of the object under examina- 

 tion. To correct these evils, this lamp was arranged, which 

 is also otherwise useful to the microscopist. It consists of 

 a stage A, supported by a tube and socket, sliding on an 

 upright rod rising from the stand. This carries an ar- 

 gand burner B ; a metal cone c rises to the level of the 

 burner, and is about one- eighth of an inch from its outer 

 margin. 



This arrangement gives a bright cylindrical flame. The 

 bottom, of the stage A is covered with wire-gauze, to cut 



