1792 



Journal of Applied Microscopy 



The base is made of two by three inch stock securely jointed with machine 

 bolts and rests on ball-bearing castors. 



The standard is six feet and two inches high and consists of two uprights of 

 three by one and one-half inch stock which stand fifteen inches apart. They 

 are bolted to the base and firmly braced. Near the top they are joined by a 

 cross piece. Midway between the uprights stands a heavy brass tube one and 

 one-half inch in diameter. The lower end of this tube is secured in the base 

 and the upper end in the cross piece. 



The lower or object carriage is a 

 light, though strong, framed bracket, 

 the vertical part of which rests against 

 the front surfaces of the uprights. 

 It is fastened to the brass tube by 

 means of two guide clamps. Each 

 clamp is provided with milled headed 

 set screws, which when "set up" 

 rigidly secure the carriage at any 

 height. On the bracket rests a 

 wooden stage twenty-eight inches 

 square. This has a dull ebony finish. 



The upper or camera carriage 

 (see Fig. 3) consists of three parts : 

 a vertical frame resting against the 

 faces of the uprights and attached to 

 the brass tube, a bracket for the sup- 

 port of the camera, and a second 

 frame for holding the camera, resting upon the upper surface of the bracket. 



Three motions are provided for in this carriage, a vertical motion and two hori- 

 zontal motions at right angles to each other. The vertical motion is arranged 

 for, as in the lower carriage, by the use of guide clamps which embrace the brass 

 tube. In order to make the vertical adjustment of this carriage as easy as pos- 

 sible a counterpoise has been placed inside the brass tube and attached to the 

 carriage by a cord passing over a pulley at the top of the tube (see Fig. 1). The 

 bracket is attached to the vertical frame by means of what is termed by machin- 

 ists a " Slide and T." The frame is ten inches broader than the bracket, thus 

 allowing ample motion. A rack and pinion is provided for making the adjust- 

 ment. 



The frame for holding the camera rests on the upper surface of the bracket 

 and is provided with a screw clamp for securing the camera firmly in position. 

 This frame has a horizontal motion by rack and pinion also of ten inches at right 

 angles to the one previously described. It runs on a brass slide and is held in 

 position by a guide. 



The apparatus is built of oak, oil finished, and all trimmings are of brass. 



In use the object to be photographed is placed on the stage, the camera 

 carriage moved up or down until the desired size of image is obtained, clamped and 

 then by means of the horizontal motions of upper carriage the image is centered 

 on the ground glass of the camera. 



I have found this apparatus of particular value in photographing brains. 

 Springfield, Mass. FREDERICK S. Ward. 



Fu;. 3. — A view of upper or camera carriage. 



