Niobe

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does the regulation "tank" act and attempts a novelty in the singing of a song while submerged. This feat is made possible by the use of a device resembling a miniature diving bell. This contrivance looks much like a metal helmet, but by means of it the vibrations of the girl's voice are made vaguely audible in the theatre.
With the diver is a young man lecturer, whose talk adds much to the turn.
Source:
Variety 45:10 (02/02/1917)