1 68 THE HISTORY AND DEVELOPMENT OF THE MICROSCOPE 



introduced a very complex but very remarkable modification of their 

 fine adjustment which is intended to obviate both the above defects. 

 It is a model ostensibly constructed for photo-micrographic 

 purposes, but if successful will speedily be applied to all their stands, 

 The entire microscope is shown in fig. 1 28, while a vertical section of 

 the fine adjustment is presented in fig. 129, and a ground plan of 

 the same in fig. 130. A point which seems to be considered of 

 importance to some German microscopists is the provision of a 

 handle by means of which the instrument may be readily moved, 

 and with the provision of this the usual large milled head controlling 

 the fine adjustment has been displaced. This is shown at H in fig. 



FIG. 129 (1898). 



128. But with the accomplishment of this there was a great desire 

 to bring about what we have so often endeavoured to show was an 

 indispensable necessity in the beautiful productions of Jena, viz. that 

 the fine adjustment should not have the burden of carrying the 

 coarse adjustment and the tube. They have not succeeded in doing 

 this ; the weight of the coarse adjustment and tube is still on 

 the fine micrometer screw. They have diminished the weight 

 that 'the fine adjustment has to support by making the body and 

 draw- tube of aluminium. The fine adjustment is placed close behind 

 the coarse one, both being fastened quite independently, so that in 



