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SUMMARY OF QUERENT RESEARCHES RELATING TO 



MICROSCOPY. 



A. Instruments, Accessories, &c.* 

 (1) Stands. 



Swift's Substag-e with Patent Slow Focusing.f — This substage 

 (fig. 25) is fitted with the Climax slow focusing adjustment, and is- 



-FINE ADJUSTMeNT 

 ■ RACK ADJUSTMENT. 



Fig. 25. 



adapted for most of this maker's instruments. This apparatus is of 

 great value for finally focusing when working upon a critical image. 

 One entire revolution of the slow -adjustment drilled head moves the 

 condenser ■ 005 inch. 



Fig. 26 



Swift's Turrell Mechanical Stage. | — In this form of mechanical 

 stage (fig. 26) both movements can be simultaneously used without 

 removing the hand from its position. The bar against which the slide 

 rests is removable, thus leaving the top plate of the stage free for the use 



* This subdivision contains (1) Stands ; (2) Eye-pieces and Objectives ; (3) 

 Illmninating aud other Apparatus ; (4) Photomicrography ; (5) Microscopical 

 Optics and Manipulation ; (6) Miscellaneous. 



t Swift and Son's Special Catalogue, 1906. J Tom. cit. 



