238 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



readily found by means of the vernier. Both rectangular movements 

 are attained by smoothly-working diagonal racks-and-pinions of superior 

 workmanship. The pinion-boxes are automatically self-adjusting to 



Fig. 26. 



take up wear. The range is sufficient to allow the systematic search 

 of a very large slide, and the fixed stage itself is of corresponding 

 dimensions. The milled heads are extra large, to secure perfect control 



Fig. 27. 



over the movements with high-power objectives. Fig. 26 shows the 

 general view of the mechanical stage, and fig. 27 gives a side view. 



Watson and Sons' New " Argus " Microscope.* — This instrument 

 has a tripod foot with a spread of C| in. The coarse adjustment is. 



* W. Watson & Sons' Supplemental Catalogue, (M 190:^. 



