Download Hi-Res version1035 x 651 (33 kbytes )
In 1853 the American J. L. Riddell (1807-1867) devised his binocular microscope, which contained the essentials of Wheatstone's pesudoscope. F. H. Wenham, another constructor, did not at first succeed in avoiding the pseudoscopic effect, but, by the application of refracting dividing prisms, he subsequently arrived at orthoscopic representations and continued the development of the different methods for producing microphotographic stereograms; this was effected in the frst case by placing a diaphragm over one half of the objective for each exposure, and in the second case by a suitable direction of the illuminating pencil (fig. 6). Of greater benefit, however, for stimulating interest in binocular microscopes, was his invention of reflecting dividing prisms (dig. 7). Of special importance is the work of E. Abbe; although, as he himself has stated, his methods accidentally led to the Wenham system, he certainly was far above his predecessors in his theoretical treatment of the problem, and in the perspicuity a
No copyright. No rights reserved. All images and text are believed to be public domain under the laws of the United States. No warranty nor guarantee is given as to the accuracy of any of this information or imagery, nor for it's suitability for any purpose. Use at your own risk. For more information about copyrights, see our Terms of Use.