328 RECORD OF CURRENT RESEARCHES RELATING TO 



which reflects light to a mirror placed in the interior of each of the 

 cylinders, whence it is reflected to the objective. 



Fig. 16. 



The drum holds five hundred objects, and when those in one 

 cylinder have been examined, the pin H is pressed and the cylinders 

 can then be revolved collectively within the outer case (the " heads " 

 of the drum revolving also), and another cylinder brought under the 

 objective and rotated by its milled head as before. 



Fig. 17. 



The instrument (made by Messrs. Beck) was exhibited at the last 

 International Exhibition, and is now in Mr. Crisp's collection. The 

 report of the jurors (Class XIII. p. 24) says that " this elaborate 

 contrivance is well adapted for the purpose for which it was designed, 

 and will eifectually protect the collection of objects from dishonesty 

 as well as from carelessness." It has also been found invaluable as a 

 means of gratifying the desire of friends to be "shown something 

 through the Microscope," without the loss of time which the ordinary 

 process so often entails, the instrument having for this purpose the 

 further advantage that as each object comes into the field of view its 

 name appears at one of the six openings below E E. 



