The Science of Illumination An Outline of the Principles of Artificial Lighting

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Due to the dis- tribution of the lamps over the whole ceiling the lighting is also very uniform, as is shown by the ratio In the illumination of interiors, account must often be taken, J)wtcLnjce> from, Centre- tine< o 5 -rn FIG. 30. LIGHTING OF A RESTAURANT. Measured values of the horizontal illumination. not only of the arrangement of lamps, the kind of lighting, and the shape of room, but also of the use to which the room is to be put, when this necessitates specially good illumination at particular points. Great attention should be paid to such conditions when making measurements, a purely schematic series of measurements being abandoned in favour of observa- tions to suit each case. An example in which the measurements and their applica- tion were made to suit the particular circumstances of use WORKED EXAMPLE 119 is that of the lighting of an art exhibition. The hall is nearly square, with an area of 330 square metres (3, 550 square feet), and is lit by four continuous current arc lamps, each (&60 29 (19-S)* x fe; J66) (6J 10m FIG.

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