8] I 



sr.MMAIiY OF CTRIiKNT liKSKARCHES RELATING TO 



C 



r* 



lower side is clamped to the table-top by an ordinary brass bench-clamp. 

 The bottom of this box measures <siin. by 7in., by Tin. deep. There- 

 fore, its side, which forms the drawing-board, measures 8Mn. by Tin. in 

 area, and is Tin. above the top of the table. When so placed, the path 



of the rays from the prism 

 of the camera to the drawing- 

 board is 10 in. 



The instrument (fig. 95) 

 is shown as arranged for 

 drawing with the compound 

 body ; but when the "loups" 

 are used, the Microscope is 

 placed upon a box 8 in. by 

 6 in., and oi in. deep. The 

 Microscope is thus raised 

 3h in., and the camera prism 

 kept the same height as with 

 the compound body, and the 

 drawing-board is 10 in. from 

 it as before. The cupboard 

 has four chocks of wood, 2^- in. 

 by If in. at each angle (fig. 96). These serve two purposes : — First, they 

 greatly strengthen the cupboard, and enable it to be attached to the 

 table-top by large screws ; further, the whole table is made very rigid, 

 because the iron brace is firmly screwed to the lower chocks in the 

 cupboard. Secondly, the chocks form a packing for the Microscope 

 cabinet, and allow it to be put into the cupboard with the key in the lock. 

 The main use of this Microscope is for the examination of un- 

 mounted objects, botanical, entomological, geological, etc. If the field- 

 lens is removed from the body, and a similar brass adapter, without any 

 lens, screwed into its place, the body is made similar to that of an ordi- 

 nary Microscope, and ordinary eye-pieces of the Continental gauge can be 



3 B 



Fig. 96. 



Fig. 97. 



used. When the body is charged with a No. 4 complanat eye-piece, the 

 powers given by the wheel of six object-glasses varies from 30 to 100 

 diameters. So by this addition of a screw adapter we have at our disposal 

 a range of eighteen powers from 2 to 100 diameters, and the instrument 

 has a considerable range of usefulness for general biological work. 



Reichert's Dark-ground Illuminator with Arrangement for 

 Centring on a Plain Stage. — This apparatus was fully described by 



