Bureau of Ordnance to Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters
Copy File No. 26-8-5
Cablegram Received Aug. <6, 1918.> 02583 RLM
Opnav, Washington. (Buord). Serial No. 9550
Ref’d to Date Action, Notes, and initials
M-4 5 <6> Aug.
S E C R E T
9550. Your 2256. If the mark 6 mine is satisfactory in 150 fathoms it can be assumed it will function equally well in 500 fathoms if provided with a special light mooring cable but the Bureau has no facilities at present for making deep sea tests to demonstrate this. 09306. 9550.
Source Note: Cy, DNA, RG 45, Entry 517B. The handwritten date is confirmed by the time/date stamp at the end of the text. Document identifier in top right-hand corner in columnar fashion: “1/3/A/J.” This message was sent via the Office of the Chief of Naval Operations and for this reason it bears the signature of Adm. William S. Benson.