CHAPTER III 



HOW TO USE THE COMPOUND MICROSCOPE 



A MICROSCOPE is a delicately constructed instru- 

 ment, and needs handling with care. When not in 

 use it should be kept in its case or under a glass 

 cover, SO that dust may not settle upon it. The 

 lacquered parts ought not to be poUshed with any 

 pohshing material, nor should they be touched by 

 fingers wet with spirits of any kind. Chemical 

 reagents applied to objects under examination, if 

 allowed to run on to the stage, may cause corrosion. 

 Except when absolutely necessary, the lenses of 

 which oculars and objectives are composed ought 

 not to be removed from their position, lest dust 

 should lodge between them. Dust on exposed sur- 

 faces of lenses, or if by any chance lodged on their 

 inner faces, can be removed by gentle cleaning with 

 very soft cloth moistened with methylated spirit. 

 Care must be taken lest lenses are scratched by 

 attempting to clean them with rough, coarse cloth 

 or by other rough usage. 



To use the microscope the eye-piece is slipped 

 into the tube at 13 (Fig. 5), and the objective is 

 screwed into the thread at the stage end of the 

 body tube at 12. The object, suitably mounted 

 on a 3-inch by 1-inch glass slip, and covered with a 



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