![]() Conversely, I suggest that the history of those entities has important lessons to teach to Issues raised by “hidden entities”, entities that are not accessible to unmediated observation, can enrich the historical In this chapter I investigate the prospects of integrated history and philosophy of science, by examining how philosophical Among those phenomena were a “light which appears about the negative electrode” and a fluorescence in the glass of the tube (, pp. He observed various complex and striking phenomena associated with the discharge. In 1857 Geissler's tubes were employed by Julius Plücker (1801–1868) to study the influence of a magnet on the electrical discharge. ![]() In 1855 the German instrument maker Heinrich Geißler (1815– 1879) manufactured improved vacuum tubes, which made possible the isolation and investigation of cathode rays. Below a certain pressure the glow assumed a stratified pattern of bright and dark bands.ĭuring the second half of the nineteenth century the discharge of electricity through gases became a topic of intense exploratory experimentation, primarily in Germany. ![]() By the middle of the nineteenth century it was known that the passage of electricity through a partly evacuated tube produced a glow in the gas, whose color depended on its chemical composition and its pressure. The latter phenomenon had been studied since the early eighteenth century. The detection of cathode rays was a by-product of the investigation of the discharge of electricity through rarefied gases. ![]()
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