56 



THE MICROSCOPE AND ITS ACCESSORIES. 



the foot of the stand is a flat tripod, with a single pillar supporting 

 the instrument arising from it. The peculiarity about this stand is 

 the tine adjustment, which is placed below the stage, the actuating 

 milled head being behind the column that supports the body- 

 tube. It has a rack and pinion coarse adjustment and a draw- 

 tube. There is a moveable glass stage, to which the object is 

 affixed by spring clips. x\n achromatic condenser, diaphragm 

 plates, and two eye-pieces are supplied with the instrument. 



Fig. 



In the various forms of the " Star " Microscope, Messrs. Beck 

 supply a useful class of stand at a ridiculously cheap rate. One 

 of their latest additions to this series is the " 'Bacteriological' 

 Star,'' Fig. 9. This instrument is made in two forms: one 

 with a sliding tube and the other with a rack and pinion coarse 

 adjustment. It is almost needless to say that for all purposes a 

 rack and pinion movement is by far the best. The fine adjustment 

 is by a micrometer screw, the milled head of which is on the top 

 of the pillar of the stand. The instrument has a draw-tube, 

 spring clips to the stage, and a swinging double mirror. The 

 special point in this stand is the sub-stage, which is on a screw 



