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Scientific American, Vol. 89, No. 8 (August 1903) (1903)

leaf 4

An illustration from Scientific American, Vol. 89, No. 8 (August 1903), 1903, leaf 4
and after careful examination and for swinging the erector—a massive arm which the rear of the shield at the present heading. In this moves something like the hands of a clock, and is the latter pronounced the marks to be from beaver case the material has been entirely removed, showing the full… … which operates the projector in a vertical direction PBOJECTOBS. PBOJECTOBS OF THE HELIGOLAND LIGHTHOUSE. © 1903 SCIENTIFIC AMERICAN, INC

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