486 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



Klonne and Midler attach a standard in front of the camera carrying a 

 stage B which is moved to and from the objective A by the fine-adjustment 

 screw F. The stige has a rod for glass diaphragms C, D, and bull's- 

 eye E. 



Fig. 141. 



Mr. J. Carhutt combines the camera and Microscope with a lantern in 

 the manner shown in fig. 142. 



Fig. 142. 



Mr. T. Charters Wliite describes a "simple method of photographing 

 biological subjects without using a Microscope."* The apparatus (fig. 143) 

 consists of an oblong lidless box, laid on its side, and securely screwed to 

 one end of a base-board 2 in. in thickness and 2^ ft. in length. The upper 

 central part of this base- board, about 1 in." in thickness, is made to slide 

 in a dovetailed groove. The end of this sliding part carries the holders A 

 for the plates employed, the holder being an ordinary photographic 

 printing frame. The size of the holder is varied according to the amplifi- 

 cation required, and by means of this sliding holder the magnification can 

 be diminished or greatly extended as may be desired. The upper side of 

 the box has an oblong opening cut in it over which a tin chimney C is 

 fixed, thus allowing the lamp to approach or recede from the stage G as 

 may be desirable. Another opening is made in that side of the box which 

 faces the plate-holder, and central with it ; this opening is closed by a movable 

 brass plate E, having an adapter with the Society screw soldered into it. 

 Below this plate a support carrying the movable stage is fixed to the side 

 of the box, the stage being moved backwards and forwards by the focusing 

 arrangement D, F. The light is derived from a Inmji, burning the purest 



* Sep. rcpr. from Journ. Brit. Dental Assoc, Oct. 188C, 8 pp. niid 1 fig. 



