NOTE ON SOME PORTABLE MICROSCOPES. 71 



The price, with 1 eyepiece and a ^-in. objective, is £4: lis. 

 Adjustable substage, with Abbe condenser of N.A. 1"2, is 

 £'2 15s. extra. 



Messrs. E,. & J. Beck, Ltd., have a Portable Continental Model 

 Microscope (Fig. 3), in which the base consists of two hinged sections, 

 which fold together for packing, and in use open out in the form 

 of a V- The focussing arrangements are by slide and micrometer 

 screw, and a draw tube is provided. The stage, having below it 



Fig. 4. 



a rotating diaphragm, is rigidly held in position by a taper pin, 

 just visible in the figure, which passes through a hole into the 

 pillar of the instrument below the stage and above the mirror 

 arm. When this pin is removed the stage may be rotated 

 through an angle of 90°, so as to lie parallel with the body. 

 The body tube is then withdra^vn and pushed into the focussing 

 jacket from below, while the mirror arm also swings out of the 

 way for packing. The morocco case measures 8 x 2| X 2| in. 

 Price of stand only in case, <£4 3s. 



Messrs. Beck also make their well-known " Star" Microscope, in 

 portable form, with folding legs, at various prices from £4: upwards. 



