A very rare example of Von Helmholtz’s Phakascope. According to Hirschberg (1886: A159):”…around 1870 [Von Helmholtz] wanted to demonstrate his theory of accommodation which he had already proven with his opthalmometer. He doubled the Purkinje catoptric images by using two prisms on the left side of the box.The observer was supposed to observe the movement of these doubled images from the right side. Holland proved 100 years later that Helmholtz had committed a severe error when constructing this instrument.” Maker is H. Sittel working in Heidelberg. Shipping costs will vary with your location and requirements.
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M and R Gordon
Michael and Roberta Gordon have been dealing in medical and dental antiques for more than four decades. They have helped build a number of major private collections and have contributed to the holdings of many museums. They also deal in other scientific and technology related items, including calculating instruments, office machines, patent models and wine-related accessories such as corkscrews. ROBERTA GORDON IS A SKILLED RESTORER WHO CAN HELP YOU WITH ANY INSTRUMENTS AND CASES THAT NEED ATTENTION. Feel free to contact them for details at: [email protected] or 718-623-6777