Sessional papers of the Dominion of Canada 1911 . .iej^- >%.-?^-5^;,v-i*;5ej&-^iJi. .--^ Si3afe*^S«fr^^ Lightning-light apparatus of the 3rd order, small size, showing a single flash every five seconds. 21-21. Occulting meclianisiii fur use in connection with drum lenses.

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