Monographie

British standard formulae for calculating the intensities of lighthouse beams and beams from cognate projection apparatus : B.S. 942 : 1949 / British standards institution

  • Texte
  • British standard formulae for calculating the intensities of lighthouse beams and beams from cognate projection apparatus : B.S. 942 : 1949 / British standards institution
  • London : British standars institution, 1949
  • 1 vol. (39 p.) ; 22 cm
  • Anglais
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