. Relative spectral transmission of the atmosphere . PRICE, 10 CENTS Sold only by the Superintendent of Documents, Government Printing OfficeWashington, D. C WASHINGTONGOVERNMENT PRINTING OFFICE 1920 Scientific Papers of the Bureau of Standards, Vol. 16. Fig. i.—Birds-eye view of terrain, showing position of near mirror N, distantmirror D, light source and spectrophotometer S RELATIVE SPECTRAL TRANSMISSION OF THEATMOSPHERE By Enoch Karrer and E. P. T. Tyndall CONTENTS page I. Introduction 377 II. General description of method 378 III. Spectrophotometric apparatus 380 IV. Testing the reliabilit
. Relative spectral transmission of the atmosphere . PRICE, 10 CENTS Sold only by the Superintendent of Documents, Government Printing OfficeWashington, D. C WASHINGTONGOVERNMENT PRINTING OFFICE 1920 Scientific Papers of the Bureau of Standards, Vol. 16. Fig. i.—Birds-eye view of terrain, showing position of near mirror N, distantmirror D, light source and spectrophotometer S RELATIVE SPECTRAL TRANSMISSION OF THEATMOSPHERE By Enoch Karrer and E. P. T. Tyndall CONTENTS page I. Introduction 377 II. General description of method 378 III. Spectrophotometric apparatus 380 IV. Testing the reliability of the method 382 V. Light sources and mirrors 385 VI. Apparatus for recording weather conditions 388 VII. Incidental and miscellaneous methods tried 389 VIII. Preliminary adjustments 391 IX. Making the observations 392 X. Reduction of observations 393 XI. Errors .f 394 XII. Results . 395 XIII. Earlier results 400 XIV. Synopsis of weather conditions 403 XV. Conclusions 406 XVI. General application of the data 407 I. INTRODUCTION The subject of the transmission of light through the atmospherehas always received considerable attention in astrophysics. Itsgreat importance there lies in connection with the determinationof the rate of reception of
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