United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 829
ing the depth of the water by 3c\ oiume of sound. 8. A vessel, a hermetically-sealed electrictransmitter secured within and directly incontact with the submerged portion of saidvessel and a receiver electrically connected 3;with said transmitter. Signed by me at Washington, District… … Witnesses: -Mi a. &«rt*s *s- £tty/ THE WOM.S PETERS CO., WASHINGTON, D.C No. 848,687. PATENTED APR. 2, 1907. C. RIDDERHOF.PHONOGRAPH. APPLICATION TILED 8EPT. 27, 1905. 3 SHEETS-SHEET 2.
Phonograph · Patents
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