72 ELEMENTARY CHEMICAL MICROSCOPY 



the instrument to use in almost any position and the speed with 

 which large areas may be studied, all combine to render this 

 type of instrument indispensable in the industries. 



One of the most satisfactory of the models of this instru- 

 ment 1 is illustrated in Figs. 30, 31. The various figures show- 



FIG. 30. Spencer Lens Co. Greenough-Type Binocular Microscope; Bausch & 

 Lotnb Lamp; Starrett Clamps; arranged for the removal of tiny fragments 

 for microscopic qualitative analysis. 



ing the microscope in different positions and with different 

 arrangements as to stages and objects are sufficiently clear 

 that they require no lengthy descriptions of the ways in 

 which the instrument may be used. The microscope, having 

 a " flexible " pillar, may also be used in a horizontal position. 



A few words are, however, necessary relating to the construc- 

 tion and adjustment of the instrument. 



1 Made by Spencer Lens Co., Buffalo, N. Y. 



