CHAPTER IV. 



FIRST ATTEMPTS WITH TRANSMITTED OR DIRECT 

 LIGHT WITHOUT A MICROSCOPE. 



With such a baseboard at disposal as that just 

 described, or its equivalent, let us now take a 

 quarter-plate camera from which the photographic 

 lens has been removed, and go step by step through 

 the movements required for making our first 

 picture without a microscope. Neither the short 

 body tube (fig. 3) nor its standard will be required 

 for this purpose. 



First place the adapter and a sin. objective in 

 the brass mount on the front end of camera. 

 Now put the camera on the wood receiving block 

 (fig. 5), fasten it with the thumbscrew, select a 

 suitable slide, say a small transparent insect, for the 

 object carrier (fig. 2), and put it in line facing the 

 lens, with sufficient room for free movement to or 

 from the camera during focussing, for in this case 

 the specimen is to be moved and not the camera. 



Almost any kind of lamp will do for lighting the 

 object if the bull's-eye be placed to collect and 

 emit the rays of light properly ; but the importance 

 of efficient illumination is so great that the reader 



