Show Scientists ts Produce Daylight 1 j In Laboratory by New Filter r J I WASHINGTON AP AP Daylight Daylight as real as ag that coming from the heavens on an aver average ge June day can be simulated with the use of or light filters fillers newly developed by scientists of the bureau of standards So real rear is the artificial light that thata a stand standard rd of daylight quality has been set Up using average noon Washington sunlight for the pattern By using filters which are small glass cells filled with certain solutions solutions solutions and specified incandescent ent sunlight or daylight which is H a mixture of ot sunlight and sky reflection reflection tion may he produced method is not suitable for room illumination but will be used as a 2 laboratory standard for running running running run run- ning tests where daylight dalight is im im- Photographic plates ma may be tested i for daylight used in industrial ili illumination il illumination n- n may also be compared to determine whether they a actually are are i producing daylight The filters are expected to have wide use in astronomy Objects heated to various temperatures give of off certain kinds of ot light By using the filters students of stars and planets may determine by the colors that are absorbed and reflected the average temperatures an h heavenly bodies This will give another key I to what actually Is taking place li litho it tho the stars I 1 The research has been carried n orr orrin nin in a Joint project by Raymond nay Day Daf i and D D. K S. S Gibson Their study covering two and one half j years rears ears I Ithe h the most complete work of or its kind Filters never have been designed design doi oi as vast vasta a s scale le either for numbers ft or accuracy 1 1 J Tho The filters are two cell glass compartments com crom One is filled with a a. alution so s lution of copper sulphate tannin a sugar alcohol pyridine and d di tilled water Th The other ther cell is file N with copper sulphate a a. small qua of sulphuric acid and distilled water f 1 By varying volumes of whole series of filters have ha 6 bea devised I |