TJie Use of a Simple Microscope. 



23 



be afforded it is an undoubted luxury. Most of the best of the 

 cheaper kinds of stands are after this model, and those on a 



Fig. 21. 



Fig. 



smaller scale supplied by Mr. Ross, at a far more moderate 

 cost, are excellent in every respect. 



One point requiring attention is the position of the axis of sus- 

 pension upon which the swinging part is balanced. I say " balanced" 

 because a good instrument is so adjusted that whatever be the 

 position to which it may be inclined, it has no Tendency to move, 

 but retains its balance. This is a point which many makers 

 have overlooked, who produce stands that, when inclined back, 

 require support to prevent their toppling over : it should be 

 especially looked to when a selection for purchase is being made. 



Useful instruments for ordinary purposes are now made with a 

 smaller amount of work, and consequently at a far less cost, such 

 is the Ql. Binocular of Mr. Baker, as represented above (Fig. 22). 

 In this, good and substantial workmanship has been combined 

 with a tolerably well arranged suspension. 



