ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



89 



makers consider that the strength and freedom from spring obtained by 

 these arrangements are unique in Microscope construction, and that the 

 method is altogether superior to that of connecting the parts solely by 

 screws. 



Watson and Sons' Attachable Mechanical Stage.*— The special 

 feature of this stage (fig. 7) is that it can be immediately fixed to a 

 Microscope without any special 

 fitting. It is placed upon the 

 stage, and grips upon the edges 

 like an ordinary sliding-bar ; 

 it is then clamped in position 

 by means of a thumb-screw. 

 It has a long range of move- 

 ment in both horizontal and 

 vertical directions. 



Portable Class-Microscope.t 

 This Microscope (fig. 8) is in- 

 tended for the use of classes Fi«. 7. 

 studying botany, zoology, &c. 



It is of German make, and though not of recent date, has points of 

 interest. The body slides in an outer tube, which has an expanded 

 foot containing a Lieberkuhn 2^ in. diameter, and an arrangement for 

 holding a slide in front of it. The object is viewed by holding the 

 instrument towards the light. The objective is separable into three 

 parts, forming powers with magnifications of 44, 96, and 130 diameters. 

 In order to focus an object, the screw-collar on the outer tube is 



Fig. 8. 



slackened, and when the focus is obtained, the collar is tightened. 

 A cap with a small hole in the centre is provided for the protection of 

 the Lieberkuhn, and when more than one lens is used the cap is 

 employed, and acts as a diaphragm when transparent objects are examined. 



* W. Watson & Sons' Catalogue, 1902-3, p. 81. 



t Exhibited at the October Meeting, 1902. See this Journal, 1902, p. 622. 



