PERSPEX FOR ROOF AND WALL • LIGHTING
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QNE of the most important factors in any building in vhich work has to be undertaken is ample natural light. This is not only good for the sight of those employed, but also saves power, representing fuel.
In this connection, Imperi a.l Chemical Industries, Ltd., Nobel 1-touse, Buckingham Gate, London, S.W.1, informs us that Perspex transparent sheet and Perspex' plastic material in corrugated sheet form have now been released for roof or vr-aIl lighting.
The plain sheet can take the place of glass, whilst the corrugated sheet is made to fit existing standards of corrugated iron and asbestos cement, and can be fitted into a roof or wall in exactly the same manner as the normal sheets, using standard book bolts or wood screws -and washers. There is no need for the work of a glazier, and as the sheets require no frames or lead flashings they can be easily transferred from one position to another when alterations are necessary, whilst by interspersing the transparent corrugated sheets with the non-transparent variety in chequer-board fashion in a roof, a shadow-free.disposition of .light can be obtained on the floor below.
The material is much safer than glass, for Perspex, under normal conditions, sill not crack or splinter under shock or vibration, and is extremely light, weighing only 0.9 lb. per sq. ft. It wears well and is not affected by atmospheric contamination, whilst its actinic value is extremely high,