Illumination Its Distribution And Measurement
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The range would be small were it not that two neutral grey glass screens are provided. One of these transmits about 10 and the other about i per cent of the light. Since either or both screens may be interposed between the interior opal screen and the double prism, or between that prism and the test-plate, the range is largely extended. An adjustable resistance allows the candle-power of the electric lamp to be adjusted so that the scale becomes direct reading.
One of the most important points ...in such an instrument is the behaviour of the test-plate for light falling on it at different angles. The reason why Millar has used a trans- lucent screen instead of matt white reflector is to enable him to command an unobstructed view of the whole hemisphere facing the test-plate, and he achieves this by viewing it from beneath. He has mistrusted the application of the cosine law to matt white reflectors, but it is doubtful whether his test- plate presents any advantage in this respect over a good opaque screen.
What to read after Illumination Its Distribution And Measurement?
You can find similar books in the "Read Also" column, or choose other free books by Alexander Pelham Trotter to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The range would be small were it not that two neutral grey glass screens are provided. One of these transmits about 10 and the other about i per cent of the light. Since either or both screens may be interposed between the interior opal screen and the double prism, or between that prism and the test-plate, the range is largely extended. An adjustable resistance allows the candle-power of the electric lamp to be adjusted so that the scale becomes direct reading.
One of the most important points ...in such an instrument is the behaviour of the test-plate for light falling on it at different angles. The reason why Millar has used a trans- lucent screen instead of matt white reflector is to enable him to command an unobstructed view of the whole hemisphere facing the test-plate, and he achieves this by viewing it from beneath. He has mistrusted the application of the cosine law to matt white reflectors, but it is doubtful whether his test- plate presents any advantage in this respect over a good opaque screen.
What to read after Illumination Its Distribution And Measurement?
You can find similar books in the "Read Also" column, or choose other free books by Alexander Pelham Trotter to read onlineMoreLess
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