CARE OF A MICROSCOPE. 



Besides acquiring the ability to properly use an 

 instrument with its accessories, it is important to 

 know how to keep it in the best working- condition. 

 It may be said without reserve that an instrument 

 properly made at the outset and judiciously used, 

 should hardly show any signs of wear either in 

 appearance or in its working parts, even after the 

 most protracted use ; and further than this, every 

 good instrument should have a provision for taking 

 up lost motion, if there is a likelihood that this 

 may occur in any of the parts. 



Especial care should be given to the optical 

 parts, in fact such care, that they will remain in as 

 good condition as when first received. Accidental 

 injury may of course occur to them, but if a syste- 

 matic manner of working is followed and a special 

 receptacle for each part is provided, this may 

 usually be avoided. 



To Take Care of a Stand. Keep free from 

 dust is one of the* first rules to be observed. This 

 may be done in a manner formerly prescribed. If 

 dust settles on any part of the instrument remove 



