ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



91 



MICROSCOPY. 



A. Instruments, Accessories, etc.* 

 (1) Stands. 



Watson and Sons' Metallurgical Microscope, " The Horizontal." f 

 This instrument (fig. 7) is designed for bench work and for photo- 

 graphic purposes. It possesses great conveniences for fine work, and is 

 extremely stable. It is attached to a bench or some firm base by means 

 of screws. The body is of extra large diameter, and has a sliding draw- 



Fig. 7. 



tube. It is fitted with rack work and pinion for focusing. The stage 

 has mechanical movements and rotates concentrically. The vertical and 

 horizontal movements are divided and read by verniers to -^ mm. ; the 

 stage is focused by means of coarse- and fine-adjustments. A compound 

 substage with screws to centre and rackwork to focus, and also double 

 mirror, are included for transparent objects. A Hook's joint handle 

 with connecting device is provided for operating the fine-adjustment of 



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

 Illuminating and other Apparatus ; (4) Photomicrography ; (5) Microscopical 

 Optics and Manipulation ; (6) Miscellaneous. 



t Watson and Sons' Supplement to Catalogue No. 2, p. 8. 



