Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 275
usion throughextra phosphorescence of the zinc sul-phide after exposure to daylight, wemade it our practice invariably to re-move the tubes into complete dark:for two hours before tests were made.The possibility of exciting phosphores-cence by exposure to artificial light inhandling the tubes was… … Luminosity Cur\es lor Samples of Radium Content (mg./gm.)- i --■ 1 and 2 show diminution in luminosity with time.I - of depth of material (0.3 mg. gm. composition). NIK ILLUMINATING ENGINEER (nov. 1918) liOU INDEX, November, 1918. PAGE Bditorial. By L. Gasteb 21G illuminating lEnQtneerino Soctcts—…
Lighting
Internet Archive · University of Toronto Libraries · Public Domain Mark 1.0. Free to use for anything.
