Incandescent electric lamps and their application

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Longmans, Green and co., 1914 - Architecture - 107 pages
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Page 15 - In general, the plane determined by an incident ray and the normal to the surface at the point of incidence is called the plane of incidence.
Page 22 - We may be gentler in attributing responsibility in the case of the former than in that of the latter.
Page 5 - The laws of specular reflection are: (first law) the reflected ray lies in the same plane as the incident ray and the normal to the surface at the point of incidence...
Page 14 - The number of a-particles entering the aperture is proportional to the activity of the source (measured by the 7-rays) and inversely proportional to the square of the distance of the source from the aperture over the range examined, viz., from 375 to 100 cm. (3) For a given intensity of radiation at a given distance, the number of a-particles entering the detecting vessel is proportional to the area of the aperture. (4) Using radium C as a source of rays, the a-particles are, on an average, projected...
Page 49 - ... squirting operation is that one obtains a somewhat moist thread, which, however, has enough coherence to be formed into filaments that do not break while being dried. The filaments are first heated under exclusion of air and then possess sufficient strength to be held in metal clamps. They are then subjected to the passage of an electric current which raises them to a high temperature, causing the filaments to sinter. The process of sintering is carried out in gases which chemically attack all...
Page 13 - The intensity of the illumination produced by a source of light is inversely proportional to the square of the distance from the source.
Page 69 - If the source is varying in intensity the iris can no longer adjust itself sufficiently quickly to protect the retina, which becomes strained in the effort to maintain clear vision in the varying field.
Page 68 - This applies particularly to school-lighting, as it is in their school days that children are in the most easily influenced stage of their development, bad lighting at their age being especially prejudicial.
Page 43 - ... series-wound arc machines, but inventors generally were trying to run several arc lamps from a single series-wound Gramme machine, giving 60 volts and, say, 20 amperes at rated output. One of the first to understand the real nature of the problem and the proper means of solving it was Edison. He realised that highresistance lamps could be worked in variable numbers in parallel on constant-pressure circuits. This seems so obvious now that we cannot understand where the difficulty came in ; but...
Page 68 - Critics may urge loss of efficiency, but in view of the high efficiency of the present-day illuminants, the loss of some part of the available energy is to be preferred to the ruin of eyesight.

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