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Notes on Anti-Submarine Defenses [website capture] (ONI, 1917) WWI
nr 8

Design and Construction of Anti-Submarine Defenses

Indicator-Nets

Electro-Contact Mine Nets




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Secret!

NOTES BEARING ON THE DESIGN AND
CONSTRUCTION OF ANTI-SUBMARINE
DEFENSES.

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SECRET.

NAVY DEPARTMENT,
OFFICE OF NAVAL INTELLIGENCE,
Washington, May 5, 1917.

This pamphlet is a reprint of confidential British publications which this office is authorized to republish.
It is very important that this information should be kept secret.
No person not a commissioned officer of the Navy should be allowed to examine this pamphlet.

ROGER WELLES,
Captain, U. S. N., Director of Naval Intelligence.

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INDEX. 
Attachments: Paragraph 
 To mooring buoys  62 
 Of timber floats to jack stays 30 
 Of barrel floats to jackstays 34 
Boom defense vessels:  
 Chief features of  42 
Calcium flares 19 
Cross connectors 9 
"Destroyer" booms 79 
Dolphin defenses 93 
Examination service 119 
Floats:  
 Spacing of 24 
 Types of 25 
 "Rendering" buoy 51 
" Holmes" light  19 
Hurdle defenses:  
 Construction and placing of  105 
Hydrophones  22 
Jackstays:  
 Length of :  15 
 "Continuous" jackstays 17 
 Size of 14 
 Attachments to 30 
Magnetophones 22 
Mine fields 23 
Moorings:  
 For vessels 52 
 For buoys 57 
 Length of pendants 48 
 Attachment of, to mooring buoys 62 
 Weights of anchors for 53 
 Cast-iron anchors for 66 
 Chain cable for 67 
 Flexible steel wire employed for 67 
Net sections:  
 Lengths of 6 
 Depth of 11 
 Detachable net sections  18 
 Net sections fitted with mines  20 
 Attachment of, to mooring buoys 62 
Net defenses:  
 Circumstances governing design 2 
 Moral effect of 85 
 Representative net defense 5 
 Nets for great depths 12 


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