Lieutenant Calvin H. Cobb, Commander, Duncan to Vice Admiral William S. Sims, Commander, United States Naval Forces Operating in European Waters
U. S. S. Duncan,
17 August, 1918.
From: Commanding Officer.
To: Force Commander, U. S. S. MELVILLE.
SUBJECT: Installation of underwater listening device on Duncan.
1. It is requested that, if possible, the M.V. listening device be installed on the Duncan during present refit, instead of the K-tube, for installation of which Cammell Laird has at present a standing order for all U.S. destroyers coming into their hands.
2. This request is made after having had an interesting experience with the K-tube which proved its inefficiency,in that instance anyway <;> after reading of the efficiency of the M.V. device as installed on the STEVENS<;> and after conversation with the Commanding Officer of the WILKES<,> on which vessel the M.V. device is being installed at Devonport. The Commanding Officer of the WILKES appears to be enthusiastic about the M.V. device and Commanding Officers of vessels fitted with the K-tube are anything but enthusiastic about that apparatus.
3. The Duncan will be in this yard for about a month. It is understood that the inventor of the M.V. apparatus is at Devonport, also that material, etc., for the installation of this device is obtainable at Devonport.
4. This seems to be a very favorable opportunity to install an efficient underwater listening device on the Duncan and it is urgently requested that steps be taken as soon as practicable and this vessel informed.
5. Work on installation of the K-tube has not been begun on this vessel yet and none will be done in this direction until the above requested information is received.
Source Note: D, DNA, RG45, Entry 520, Box 338. Document identifier: “44-5-W” in upper left corner of document. Time date stamp in upper left corner indicates the document was received by Sims on 20 August, 1918.