| Show DATA ON ultraviolet ULTRA VIOLE TRAYS IN SUNLIGHT ISSUED BY BUREAU STANDARDS the much discussed and popular subject of ultraviolet ultra violet rays rog plied by biologists ani and physicians as of special importance for healing pui par poses particularly in the treatment of rickets is reported on by the dureau duleau of standards in its journal or of research Re lor for june in an article riving data as to the amount and variations of these rays in sunlight it has been found that common window plass glass shuts out some wave ae lengths of sunlight that have h ne the pro pio porty perty or of preventing tickets rickets tile the bureau or of standards standard states analysis anas ls shows allows that the constituent shut out by window glass consists of the shor shortest lest wave lengths in ili sin sunlight 11 light this constituent or component of the total incident rit sunlight Is greatly reduced deduced by the crice of smoke dust etc |
