MICROSCOPES. 

 Fig. 759. 



245 



Oxy-Hydrogen Microscope. (Fig. 759, as above.) This 

 is a valuable instrument of public exhibition, so called be- 

 cause the light is formed by the action of hydrogen, thrown 

 in an ignited state upon a cylinder of lime ; its flame being 

 at the same time urged by a jet of oxygen, or rather the 

 two gases are previously mixed together, and thrown upon 

 the lime. The instrument in other respects nearly resembles 

 the magic lantern. Fig. 1 shows the whole complete : A 

 and B are two cocks, connected with the gas bags holding the 

 gases, one of which is twice the size of the other twice the 

 quantity of hydrogen being necessary. These cocks are 

 connected with the blow-pipe chamber, c ; from the top of 

 which a jet conveys them against a small cylinder of lime, 

 D, producing an intense white light, which is reflected by 

 the reflector, E, on to the lenses in the tube of the instru- 

 ment. Fig. 2 shows the best method of arranging the 

 glasses ; A is here the reflector ; B the light ; c a double 

 21* 



