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Captain Richard H. Jackson, United States Naval Attaché in Paris and United States Naval Staff Representative, to Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters

July 16, 1918

Source, Naval Attache, Paris                       Copies to C S

C S 2

Subject Listening apparatus.                                 P 1

A C1


Experiments made with the Walser listening apparatus by the French Gunboat ENGAGEANT and submarine AMARANTE have convinced the Commission that all gunboats should be equipped with this device as quickly as possible.

Under very favorable conditions the ENGAGEANT was able to hear the submarine for a distance of 4100 meters. Sonorous contact was lost at 5000 meters.

Commander of MOUETTE 11, escorting convoy to Messina-Corfu, and Palermo three times attackes [i.e., attacked] by submarine unsuccessfully attributes his success to the Walser apparatus.

Source Note: Cy, DNA, RG 45, Entry 520, Box 337.

Footnote 1: Capt. Nathan C. Twining, Chief of Staff, Capt. Walter R. Sexton, Asst. Chief of Staff, Capt. Frank H. Schofield, Planning Section, United States Naval Forces Operating in European Waters. The editor was unable to determine which section is denoted by the initials “A C".

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