151 



Messrs. Watson and Sons' New Cheap Centring Substage 

 for Elementary Microscopes. 



{Exhibited June 2Ut, 1895.) 



This, as the cut shows, is a serviceable centring substage. 



The screws acting against opposing springs enable the optic 

 axis of the condenser to be aligned to that of the microscope with 

 celerity and precision. 



When we remember that it is not so many years ago when 

 anything in the form of a centring substage cost £10, we shall 

 the more readily appreciate this simple, yet efficient device. 



It can be adapted to almost any form of student's microscope. 



