SIMPLE MICROSCOPES. 



Simple microscopes are usually termed magnifiers 

 and whether consisting of one or several lenses in 

 close contact, always remain simple. They are made 

 to be held in the hand or are fixed on a stand or 



mounting, which is pro- 

 vided with adjustments 

 for focusing, thus giving 

 steadiness and leaving the 

 hands free for dissecting 

 Fl8 ' 14 ' or moving the object 



during observation. Magnifiers are made in a large 

 variety of forms, the difference appearing in their 

 optical as well as mechanical construction. The most 

 common are those with one or several double convex 

 lenses mounted in hard 

 rubber or vulcanite, 

 nickel, aluminum, cel- 

 luloid, etc., and ar- 

 ranged to be folded for 



Fig. 15. 



pocket use as shown in 



Fig. 14 and Fig. 15. Those containing several lenses 



are preferable, since they offer a variety of magnify- 



