68 



GENERAL MICROBIOLOGY 



7. With the eye at the ocular, focus up slowly with the 

 coarse adjustment until the specimen comes plainly into 

 view. 



// the light is too intense the focal point may be passed 

 without noticing it. 



8. When the object is brought fairly well into focus by 



FIG. 24. Comparison Ocular Enabling One to Observe Two Different 

 Microscopic Fields Side by Side. Any two microscopes may 

 be used, (Healy.) 



means of the coarse adjustment, use the fine adjustment 

 to obtain the sharpest focus to bring out details. 



9. Move the specimen when trying to obtain a focus, 

 as a moving object is more apt to be noticed as the lens 

 comes into focus. 



The microscope reverses the image. This will be noticed 

 when the specimen is moved. The microscope magnifies 

 the movement as well as the image; it therefore requires 



