Introduction

  • J. J. de Groot
  • J. A. J. M. van Vliet
Chapter
Part of the Philips Technical Library book series (PTL)

Abstract

Mankind has been making use of artificial light for thousands of years. But it was only towards the end of the last century that the role played by sodium in both daylight and artificial light was discovered. In 1860, Kirchhoff showed that the reversed D-lines in the spectrum of the sun observed by Wollaston and Fraunhofer are identical to the yellow sodium D-lines in the light emitted by flames.

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Copyright information

© Kluwer Technische Boeken B.V. - Deventer 1986

Authors and Affiliations

  • J. J. de Groot
  • J. A. J. M. van Vliet

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