430 



SUMMAKY OF CUKRENT RKSKA ROM KS RELATING TO 



and 35 mm. vertically. As an alternation, the interchangeable Long 

 Range Mechanical Stage (fig. 2) may be fitted. It is claimed for this 

 type of stage that it is fully equal to the stage which is built as part of 



Fig. 2. — Murray's Long Eange Attachable Stage. 



tlie microscope. The method of attachment is a simple one, consisting 

 of two pins which pass through the holes usually occupied by the butts 

 of the object springs. These steel pins have screwed ends, and the 

 stage is secured by nuts which fit on these screws. The substage turns 



Fig. 3. — Watson's " Speera " Magnifiers. 



aside from the optical axis, which has centring screws and rackwork to 

 focus. It is altogether a massive and imposing instrument, and of a 

 design that finds favour in the laboratories of to-day. 

 ^^ The Long Range mechanical stage (fig. 2) referred to in connexion 



