THE WALMSLEY PHOTOIICROGBAPHIC CAMERA. 



Manufactured by the American Optical Co. Now in use by 



many Colleges and leading Microscopists, and is an efficient, practical 

 and cheap instrument for the purpose. 



It is made in two forms : the cheaper, No. 1, (selling for $18.00) is 

 adapted only to the making of negatives on plates 3^x4}^, or 4J^x5^, as 

 may be necessary. The complete form No. 2 (costing $30) is also a minia- 

 ture enlarging, reducing, and copying camera, admirably adapted to the 

 production of lantern transparancies from any size negative up to 4J^x5^. 



The camera (of mahogany) is square, carrying a Flammang single 

 plate holder for 4^x5} plates ; usable vertically or horizontally, and with 

 kits for 3^x4j^ plates. The bellows are in two sections, with a central 

 division of mahogany, which carries a removable partition, to which a suit- 

 able rectilinear photographic lens can be attached, for enlarging, reducing, 

 or copying. A light-tight door on one side of this wooden section gives 

 ready access to the lens for inserting or removing diaphragms, or other 

 necessary manipulations, whilst a milled head, accessible from the same 

 opening, clamps the lens-bearing section firmly to the bed of the camera at 

 any desired point. 



The bellows have an extension ot two feet in addition to the length of 

 the box, sliding very smoothly upon V-shaped ways, which for greater con- 

 venience are made in two sections, firmly attached to each other by wooden 

 dowels, and a solid brass screw, worked by a milled head. 



The bellows are firmly held at any desired point of extension by a cam, 

 operated by a lever conveniently placed at the rear of the focusing screen 

 which latter is hinged at the bottom, and when not in use, lies out of the 

 way upon the extension bed. 



v 



