22 



THE AMERICAN MONTHLY 



J 



of its mechanism, and practicability in 

 all. Among its novel and good 

 features may be noticed the base, 

 which may be instantly converted • 

 into an excellent turn-table, which 

 may be held by the microscope-body 

 as a support, as in Fig. 4, or by a 

 screw-clamp attachment, which is 



power objectives, while the coarse 

 adjustment and the draw-tube will 

 permit the lowest powers to be em- 

 ployed. The mirror-bar is so made 

 that the mirror can be placed at any 

 angle above or below the stage, allow- 

 ing the greatest obliquity of illumina- 

 tion for tests, and dispensing with the 

 use of a bulls-eye condenser for 

 opaque objects. When desired, it 

 can be shoved close to the stage, or 

 to one side, quite out of the way. A 

 taper-holder can easily be attached 

 to the mirror-bar, to furnish illumin- 

 ation for class use. The main tube 

 and the draw-tube together, give the 

 standard length of ten in- 

 ches. The stand is of brass, 

 heavily nickel-plated, manu- 

 factured with great care by 

 skilful workmen ; and when 

 boxed for transporta- 

 tion, it requires a box 

 only seven inches 

 long, three and one- 



FiG. 5.— Griffith Club Microscope, E. H. Griffith's patent. 



also original and used to clamp the 

 microscope to its box when used with 

 the turn-table base, or to clamp the 

 body to any support when the base is 

 removed. The fine adjustment is 

 made by a spiral grooved-wheel, which 

 is very convenient and very prac- 

 tical, allowing the use of the highest 



half inches wide, and two and one- 

 half inches deep, interior measure. 

 In addition to the stand and turn- 

 table attachment, three objectives of 

 the largest size, an extra eye-piece 

 and other accessories, can be put in 

 the same box ; when set up for use it 

 is a full size microscope, capable of 



