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41 Steinheil, Carl August von
[br]b. 1801 Roppoltsweiler, Alsaced. 1870 Munich, Germany[br]German physicist, founder of electromagnetic telegraphy in Austria, and photographic innovator and lens designer.[br]Steinheil studied under Gauss at Göttingen and Bessel at Königsberg before jointing his parents at Munich. There he concentrated on optics before being appointed Professor of Physics and Mathematics at the University of Munich in 1832. Immediately after the announcement of the first practicable photographic processes in 1839, he began experiments on photography in association with another professor at the University, Franz von Kobell. Steinheil is reputed to have made the first daguerreotypes in Germany; he certainly constructed several cameras of original design and suggested minor improvements to the daguerreotype process. In 1849 he was employed by the Austrian Government as Head of the Department of Telegraphy in the Ministry of Commerce. Electromagnetic telegraphy was an area in which Steinheil had worked for several years previously, and he was now appointed to supervise the installation of a working telegraphic system for the Austrian monarchy. He is considered to be the founder of electromagnetic telegraphy in Austria and went on to perform a similar role in Switzerland.Steinheil's son, Hugo Adolph, was educated in Munich and Augsburg but moved to Austria to be with his parents in 1850. Adolph completed his studies in Vienna and was appointed to the Telegraph Department, headed by his father, in 1851. Adolph returned to Munich in 1852, however, to concentrate on the study of optics. In 1855 the father and son established the optical workshop which was later to become the distinguished lens-manufacturing company C.A. Steinheil Söhne. At first the business confined itself almost entirely to astronomical optics, but in 1865 the two men took out a joint patent for a wide-angle photographic lens claimed to be free of distortion. The lens, called the "periscopic", was not in fact free from flare and not achromatic, although it enjoyed some reputation at the time. Much more important was the achromatic development of this lens that was introduced in 1866 and called the "Aplanet"; almost simultaneously a similar lens, the "Rapid Rentilinear", was introduced by Dallmeyer in England, and for many years lenses of this type were fitted as the standard objective on most photographic cameras. During 1866 the elder Steinheil relinquished his interest in lens manufacturing, and control of the business passed to Adolph, with administrative and financial affairs being looked after by another son, Edward. After Carl Steinheil's death Adolph continued to design and market a series of high-quality photographic lenses until his own death.[br]Further ReadingJ.M.Eder, 1945, History of Photography, trans. E.Epstean, New York (a general account of the Steinheils's work).Most accounts of photographic lens history will give details of the Steinheils's more important work. See, for example, Chapman Jones, 1904, Science and Practice of Photography, 4th edn, London: and Rudolf Kingslake, 1989, A History of the Photographic Lens, Boston.JWBiographical history of technology > Steinheil, Carl August von
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42 Mind-body Problem
From this I knew that I was a substance the whole essence or nature of which is to think, and that for its existence there is no need of any place, nor does it depend on any material thing; so that this "me," that is to say, the soul by which I am what I am, is entirely distinct from body, and is even more easy to know than is the latter; and even if body were not, the soul would not cease to be what it is. (Descartes, 1970a, p. 101)still remains to be explained how that union and apparent intermingling [of mind and body]... can be found in you, if you are incorporeal, unextended and indivisible.... How, at least, can you be united with the brain, or some minute part in it, which (as has been said) must yet have some magnitude or extension, however small it be? If you are wholly without parts how can you mix or appear to mix with its minute subdivisions? For there is no mixture unless each of the things to be mixed has parts that can mix with one another. (Gassendi, 1970, p. 201)here are... certain things which we experience in ourselves and which should be attributed neither to the mind nor body alone, but to the close and intimate union that exists between the body and the mind.... Such are the appetites of hunger, thirst, etc., and also the emotions or passions of the mind which do not subsist in mind or thought alone... and finally all the sensations. (Descartes, 1970b, p. 238)With any other sort of mind, absolute Intelligence, Mind unattached to a particular body, or Mind not subject to the course of time, the psychologist as such has nothing to do. (James, 1890, p. 183)[The] intention is to furnish a psychology that shall be a natural science: that is to represent psychical processes as quantitatively determinate states of specifiable material particles, thus making these processes perspicuous and free from contradiction. (Freud, 1966, p. 295)The thesis is that the mental is nomologically irreducible: there may be true general statements relating the mental and the physical, statements that have the logical form of a law; but they are not lawlike (in a strong sense to be described). If by absurdly remote chance we were to stumble on a non-stochastic true psychophysical generalization, we would have no reason to believe it more than roughly true. (Davidson, 1970, p. 90)We can divide those who uphold the doctrine that men are machines, or a similar doctrine, into two categories: those who deny the existence of mental events, or personal experiences, or of consciousness;... and those who admit the existence of mental events, but assert that they are "epiphenomena"-that everything can be explained without them, since the material world is causally closed. (Popper & Eccles, 1977, p. 5)Mind affects brain and brain affects mind. That is the message, and by accepting it you commit yourself to a special view of the world. It is a view that shows the limits of the genetic imperative on what we turn out to be, both intellectually and emotionally. It decrees that, while the secrets of our genes express themselves with force throughout our lives, the effect of that information on our bodies can be influenced by our psychological history and beliefs about the world. And, just as important, the other side of the same coin argues that what we construct in our minds as objective reality may simply be our interpretations of certain bodily states dictated by our genes and expressed through our physical brains and body. Put differently, various attributes of mind that seem to have a purely psychological origin are frequently a product of the brain's interpreter rationalizing genetically driven body states. Make no mistake about it: this two-sided view of mind-brain interactions, if adopted, has implications for the management of one's personal life. (Gazzaniga, 1988, p. 229)Historical dictionary of quotations in cognitive science > Mind-body Problem
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