CH. IX] ORDINARY MICROSCOPE FOR PROJECTION 



265 



FIG. 146. USE OF THE SIMPLE 

 MAGIC LANTERN CONDENSER 

 AND LAMP AND AN ORDINARY 

 MICROSCOPE FOR PROJECTION. 



This is a magic lantern with 

 iron legs and rods for the support 

 and guidance of the parts (fig. 

 33). The slide-carrier bellows 

 and lantern objective with the 

 guide rods have been removed, 

 leaving only the condenser, arc 

 lamp and lamp-house. The short 

 tubes for the lamp are supported 

 at the left by the ordinary legs 

 of the apparatus. In front a 

 support of wood is used when 

 necessary . As the whole lamp and 

 condenser would be too low for 

 the axis of the microscope it is 

 raised on a block (BlockJ to the 

 proper height. There is a base- 

 board on which all the apparatus 

 is placed, and at the left there is 

 a track made of rods or tubes as 

 in fig. 158, 159 on which the block 

 supporting the microscope can 

 be moved back and forth in line 

 of the axis. For a water-cell, a 

 glass box made as described in 

 394a is set on a block in the 

 path of the cone from the con- 

 denser. 



Commencing at the left : 

 Arc lamp The hand-feed, 

 right-angle carbon arc lamp. 

 5. s Set screws. 



This is also an excellent meth- 

 od of making small glass boxes for 

 experimental work where water is 

 the liquid medium. Such boxes 

 also have been used continuously 

 for months for observing the 

 growth of aquatic plants. If one 

 side is made of cover-glass, then 

 high powers of the microscope 

 can be used to study the growth 

 on the inside face of the cover- 

 glass. 



We are indebted to Prof. Romyn 

 Hitchcock for the method of mak- 

 ing water-cells by the aid of 

 Ripolin paint. 



