42 



Each of the stages specified under i 4 is so constructed that all ordinary 

 sizes of object -carriers may by used. The preparations are moved about on the 

 stage platform in a similar manner as if done by hand, so that the full aperture 

 of the condensers of the illuminating apparatus is effective. 



We do not construct attachable stages for either our small or our dissecting 

 stands. The small mechanical stage could certainly be fitted to Stand VI a by 

 making a slight alteration, but the range of the movement of the sliding pieces 

 would be curtailed. 



The Prism - Rotator designed by Mr. H. S. GREENOUGH is a suitable 

 accessory to the binocular stand X a and also to other stands having a stage 

 aperture of 33 mm (about P/ s in.) diameter. 



The Capillary Itotator, constructed in accordance with the suggestions of 

 the same designer, may be used in connection with stands having a smaller 

 stage aperture. 



(For particulars regarding the above two appliances refer to pp. 109 & 110.) 



For the purpose of determining the amount of very delicate movements 

 in one particular direction, especially where exact measurements of horizontal 

 displacements are in question, our Stage Screw-Micrometer, No. 126, will be 

 found useful. (Further details of this apparatus may be seen on p. 94.) 



A. very simple contrivance for moving a counting chamber , &c., is 

 supplied in our Movable Staye for the Counting Chamber, p. 98. This 

 may also be applied to stands not adapted for the use of mechanical stages. 



We may here also mention the so-called MALTWOOD Finder (see " Zeit- 

 schrift f. wiss. Mikrosk." vol. V, 1888, p. 40), which is an auxiliary appliance for 

 refinding any particular spot in a specimen under examination. It is a "finder" 

 appliance of the simplest description and may be used ivith any of our movable 

 stages. (See p. 114.) 



C. The Focusing of the Objectives. 



The coarse adjustment. The coarse adjustment of the sliding-tube type 

 has only been retained with Stand VII and the Hand Microscope. Focusing by 

 means of movement by hand is done only in the case of Dissecting Stand P V 



