By Marc J. de Vries, Marc J. Vries
Considering global conflict I, the Natuurkundig Laboratorium has been a very important middle of business learn for Philips, one of many world’s biggest electronics businesses. during this research, Marc J. de Vries demonstrates how the historical past of the laboratory might help us comprehend vital adjustments within the creation and makes use of of know-how within the 20th century. Breaking their examine into 3 classes, each one characterised through diversified learn targets and ways, the authors increase this common background with certain case stories. the end result can be of worth to somebody learning the background and philosophy of know-how.
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Extra info for 80 Years of Research at the Philips Natuurkundig Laboratorium (1914-1994): The Role of the Nat. Lab. at Philips
Lab. was secondary electron emission. As we saw from the description of the Pentode, this phenomenon was to be avoided in normal radio tubes, because it distorted the signal. But the same phenomenon could be used for amplifying purposes. H. 58 He found that magnesium oxides in particular were usable. H. Jonker developed photomultipliers that were used for amplifying television signals while the Nipkov technique was still being used. The photomultipliers were used to replace the photocells because of their faster response to changes in light intensity.
The difference signal was then selected and amplified. Both types had their pros and cons. When it became more desirable to have a broad range of tuning frequencies (20 MHz to 150 MHz), it was the super-heterodyne that won the battle. Transmitter tubes were intended for a totally different market than receiver tubes. Radio receiver sets were to be sold to consumers, but transmitter tubes for radio broadcasting were destined for professional use. With this 38 80 years of research at the philips natuurkundig lab.
In the late 1920s the company’s directorate debated whether or not Philips should become involved in television. Later we shall see the role that Holst fulfilled in this debate. Lab. was that some television research activities were included in the research programme. Lab demonstration of television was given on Saturday, December 22, 1928, by Druyvesteyn, who for that purmarc j. de vries 45 pose used the existing Nipkov concept. ’s mission. Lab. 51 In that connection Blanken also referred to Holst’s inaugural lecture at the University of Leyden, where he had been appointed professor to a named chair in 1930.
80 Years of Research at the Philips Natuurkundig Laboratorium (1914-1994): The Role of the Nat. Lab. at Philips by Marc J. de Vries, Marc J. Vries