 | Paul Davies, P. C. W. Davies - 1989 - 526 pages
...plate was up to 2000 hours (about three months). He described his light source in the following way: 'A simple calculation will shew that the amount of...burning at a distance slightly exceeding a mile.' In no case did Taylor find any diminution in the sharpness of the interference pattern, supporting... | |
 | Thomas William Körner - 1996 - 548 pages
...brought it up to the standard of blackness. Ten seconds sufficed for this. A simple calculation will show that the amount of energy falling on the plate during...standard candle, the amount of energy falling on 1 cm2 of the plate is 5 x 10~6 ergs/sec and the amount of energy per cm3 of this radiation is 1.6 x 10"16... | |
 | G. K. Batchelor, Sir Geoffrey Ingram Taylor - 1996 - 318 pages
...had recently purchased. With maximum darkening the amount of energy falling on the photographic plate was the same as that due to a standard candle burning at a distance of about one mile, but after three months exposure the plate showed a pattern which was as sharp as... | |
 | Alan A. Grometstein - 1999 - 620 pages
...plates set between it and the mask with the slits. He wrote that the light passing through the slits "was the same as that due to a standard candle burning at a distance slightly exceeding a mile."3 It is difficult to interpret this, but consider the following: if you look at a 5-W light source... | |
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In order to get some idea of the energy of the light falling on the platen in these experiments a plate of the same kind was exposed at a distance of two metres from a standard candle till complete development brought it up to the standard of blackness.... 