[ 55 ] 



SOME STUDENTS' MICROSCOPES. 



C. Baker. — Last year Messrs. Baker brought forward a very 

 convenient form of student's microscope, illustrated by Fig. 6. 



The instrument is support- 

 ed on two columns, which 

 arise from a horse-shoe foot. 

 It has a rack and pinion 

 coarse adjustment, a differen- 

 tial screw fine adjustment, 

 and a draw-tube. The stage 

 is of the horse-shoe shape, as 

 advocated by Mr. E. M. 

 Nelson, and it is provided 

 with a Wright's finder ; this 

 will be found to be a most 

 useful addition. The sub- 

 stage carrying the condenser 

 is worked by a rack and 

 pinion adjustment. It is 

 moreover provided with cen- 

 tring screws. 



Instead of the horse-shoe 

 base, this instrument can also 

 be supplied with a tripod foot, 

 which form of base is cer- 

 tainly to be preferred. Fig. 7 

 illustrates the same makers' 

 Fig- 6. stand of their " Nelson " 



model series. As can be seen by the figure, the instrument is on 

 a tripod foot, and has a rack and pinion coarse adjustment, differ- 

 ential screw fine adjustment, and a draw-tube. It has a horse-shoe 

 stage with sliding-bar, but if preferred a circular rotating stage 

 can be substituted. The sub-stage can be had either with or 

 without centring movements. 



R. AND J. Beck. — This firm supplies a great variety of expen- 

 sive stands and is largely patronised by students. Fig. 8 illustrates 

 their " Pathological " Microscope, as represented in the new edi- 

 tion of " Carpenter on the Microscope." It will be noticed that 



