1 68 THE HISTOl.'Y AND DEVELOPMENT OF THE MICROSCOPE 



intioduced a very complex but very remarkable modification of their 

 line adjustment \\hicli i> intended to obviate both the above defects. 

 |i is a model ostensibly constructed for photo-micrographie 

 purpose.-, but if successful will >peedily be applied to all their stands. 

 'I'lie entire microscope is shown in fig. 128, while a vertical section of 

 the line 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 ( lerman microscopists is the provision of a 

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

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

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



Fi<i. I'J'.t iisi.18). 



Hut with the accomplishment of this there was a great desire 



to bring aboul uhat \\e have >,, nl'ten endeavoured to show was an 



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



the line adjustment should not have the burden of carrying the 



adjustmenl and the tube. They have not succeeded in doing 



\\eight of the coarse adjustment and tube is still on 



i'i'- micrometer screw. They have diminished the weight 



adjustment ha- to support by making the body and 



F aluminium. The fine adjustmenl is placed close behind 



one, both being fastened quite independently, so that in 



