. Spectroradiometric Investigation of the Transmission of Various Substances, II: Infra-red transmission characteristics of organic oils and other substances . thespectral region extending from 3 to 15/i, which was the extentof the spectrum examined. 12 Celluloid from The Celluloid Co., New York City; pyralin from E. I. du Pont de Nemours & Co.,Arlington, N. J.; and viscoloid from The Viscoloid Co., Iveominster, Mass. Pub. No. 97, p. 42, Carnegie Institution of Wash.; 190S.* Pub. No. 6s, p. 60, Carnegie Institution of Wash.; 1906. 274 Scientific Papers of the Bureau of Standards In the ultra-v
. Spectroradiometric Investigation of the Transmission of Various Substances, II: Infra-red transmission characteristics of organic oils and other substances . thespectral region extending from 3 to 15/i, which was the extentof the spectrum examined. 12 Celluloid from The Celluloid Co., New York City; pyralin from E. I. du Pont de Nemours & Co.,Arlington, N. J.; and viscoloid from The Viscoloid Co., Iveominster, Mass. Pub. No. 97, p. 42, Carnegie Institution of Wash.; 190S.* Pub. No. 6s, p. 60, Carnegie Institution of Wash.; 1906. 274 Scientific Papers of the Bureau of Standards In the ultra-violet these samples show considerable absorp-tion at M and are opaque to radiations of wave lengths lessthan ;u. Judging from the behavior of other substances, the opacity ofsamples of celluloid, etc., which become discolored, is increasedin the violet and ultra-violet, but not in the infra-red. Selenite.—The spectral transmissions of various thicknesses ofselenite, CaS04 + 2H20 are given in Fig. 7. For curve A, thethickness ^ = mm.; for curve B, ^ = mm; and for curveC, t = mm. The data were obtained in order to supplement. 1-2 1^6 2-0 2-J 3:2^ Fig. 7.—Selenite; thickness, A= mm, B= mm, C= mm previous investigations of substances containing water of crys-tallization.*^ In the present work the previously observed asym-metrical absorption band at to 3/x is resolved into severaldistinct absorption bands. Considered in connection with theprevious observations it appears that all these absorption bandsare caused by water. Paraffin Oil.—The material examined was a colorless Uquidpetrolatum (liquid paraffin) of American origin and great purity,used for medicinal purposes. The second sample was a petroleum distillate (paraffin base)having a light brown color and a boiling point of 272 to 2 74°Cat 2 mm pressure. Cobiebtz] Transmission of Various Substances 275 The spectral transmissions of these two samples were foimd tobe identical. Th
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