WARINGTON'S UNIVERSAL MICROSCOPE. 105 



When this addition is made, however, the instrument is adapted 

 to any kind of work to which the preceding can be applied ; it 

 can receive the same fittings ; and in consequence of the larger 

 dimensions of the stage, a traversing movement may be readily 

 added to it. This Microscope may thus be rendered a very com- 

 plete instrument ; but it will scarcely be so convenient in use, as 

 the instruments which are specially planned for a greater range 

 of adaptations ; and the particular advantage it possesses, is for 

 the purpose indicated by its designation. 



36. Warington' s Universal Microscope. A new set of adapta- 

 tions for special purposes, called for by new requirements, has 

 been recently devised by Mr. Warington ; who, by different com- 

 binations of the same very simple materials, has produced an in- 

 strument which may be used in four different modes, and which 

 may fairly, therefore, be designated a " universal" microscope. 

 Mr. Warington 's original object was to provide an arrangement, 

 whereby the Compound Microscope should be brought to bear 

 upon living objects in an Aquarium, when these might be either 

 in contact with one of the glass sides, or be not far removed from 

 it. This he accomplished by making use of the body of a Stu- 

 dent's microscope ( 34), with the grooved limb in which it slides, 

 and attaching the latter by a strong cradle-joint to a tubular 

 stem, which could be fixed at any height upon the edge of the 

 table that supports the Aqua- 

 rium, by means of a clamp with FIG. 23. 

 a binding screw. Subsequently 

 Mr. W. dispensed with the rack ; 

 attaching the cradle-joint at the 

 top of the tubular stem to an 

 outer tube, within which the 

 sliding of the body acts as a 

 "coarse" adjustment; and pro- 

 viding a "fine" adjustment (by 

 an ingenious plan of his own) 

 at the object end of the body 

 itself. To the Author, how- 

 ever, it has seemed far more 

 convenient to retain the rack ; 

 and this he has combined with 

 the sliding tube, thus obtaining Waringtou , s Universal Microscope , as arranged 



great facility Of adjustment With for viewing objects in an Aquarium. 



no perceptible "twist;" and 



the arrangement of the apparatus, with this modification, is 

 shown in Fig. 23. If the rack be well cut, there will be no oc- 

 casion for a "fine" adjustment; since the purposes to which this 

 arrangement is adapted, only require low or moderate powers. 

 When the instrument is set up in the above position, the body 

 may be moved like a swivel from side to side, and it may be 

 inclined downwards at any degree of obliquity; but its most 



