1895.] MICilOSCOPiCAL JOURNAL 375 



those for a camera carrying 4x5 plates, the only size so 

 far constructed. They would have to be proportionally 

 greater for a larger sized box. 



The base or platform is of polished mahogany or other 

 hard wood-, 26 inches long, standing upon three very 

 short feet, to insure steadiness on any table or other 

 support; the front end being heavily weighted beneath. 

 At the other end of the platform a stout frame of 

 japanned iron, 24 inches in length, with joint closed to its 

 base is firmly bolted. This frame carries the camera, 

 which slides freely in parallel grooves, milled in its upper 

 surface, and can be secured at any desired point by a 

 stout screw passing through a slot running the entire 

 length of the frame in its centre. The joint permits the 

 frame carrying the camera to be placed and firmly held 

 in either vertical or horizontal positions, or inclined at an 

 angle of 45°. For copying or making lantern slides from 

 negatives, by enlargement or reduction, the latter posi- 

 tion is almost indispensable, and is one of the most 

 valuable "new points" embraced in the "Autograph" 

 camera as will be seen presently. 



The camera box is furnished with leather bellows of 

 best quality, extending twelve inches, which has been 

 found to be the most generally useful, though double 

 that length can be employed if necessary or desirable. It 

 is fitted with a reversible back carrying both focussing 

 screen and plate holder, a most desirable feature, as it 

 greatly facilitates the proper management of the object 

 in relation to its position on the plate, where the micro- 

 scope is unprovided with a rotating stage. The ground 

 glass focussing screen is mainly useful for arranging the 

 illumination, and the object in the field of view, its sur- 

 face being too coarse to permit fine focussing with high 

 powers. It may, however, be easily removed from its 

 frame and replaced by a sheet of plate glass, when by 



