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Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 653
|io)©©@ @ @ <0) (Q) ^ (Q) @) @) ©©@©®j … Fig. 305.—Revolving Light Apparatus. the flame. Accordingly he devoted himself, in conjunction with his friendArago, to this preliminary consideration. Their studies and experimentsled them to the construction of the lamp with several concentric wicks—bywhich a brilliancy of light is obtainable…Inventions
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