part ni british underwater ordnance disposal handbook, part... · 2020. 11. 17. · (h) mine...

PART in

BRITISH UNDERWATER ORDNANCE

CONFIDENTIAL

TABLE OF CONTENTS

PART I I I - BRITISH UNDERWATER ORDNANCE

CHAPTER 1

BRITISH INFLUENCE MINESPage

Mine Cftart (Tuble 1) .......................................................................................... 2In troduction ......................................................................................................... 3"A " Mark I ("A " Mark I I , I I I and IV ) .......................................................... 5A

« A nA

Mark V T ............................................................................................ ..MX"A " Mark

U f l r l fV T T ...........................................................................................

•nu t*•V t i r k T T ............................................................................................ ,

"M" Mark I l l ......................................................

CHAPTER 2

BRITISH CONTACT MINES

Mine Chart (Tab le 1) .......................................................................................... 2In troduction .......................................................................................................... 3H I I Murk I I ........................................................................................................ 5•*T" Mark I I I ......................................................................................................... 9V ickers Antenna .................................................................................................... 11Murk XIV (Mark XV, XVI and X V II) ................................................................. 15Mark XIX ................................................................................................................ 21Mark XIXs (Mark XXVII) .................................................................................... 25Mark XX (Mark XX*) ............................................................................................ 29Murk XXII (Mark X X II* ) .................................................................................... 33Mark XXV ................................................................................................................ 37

CHAPTER 3

BRITISH TORPEDOES

Torpedo Chart (Table 1 ) .................................................................................... 2Warhead Chart (Tablo 2) .................................................................................... 4In troduction .......................................................................................................... 621" Duplex Impact-Only Exploder, Mark I and I * * .................................... 7C.C.R. Exploder, Mark I and I * * .................................................................... 1118" Duplex Exploder, Mark I (Mark I I ) ........................................................ 13Above-Water Sxplodor .......................................................................................... 15Exploder Churt (Table 3) .................................................................................. 20Type 3 E x p lo d e r .................................................................................................... 21

CHAPTER 4

BRITISH DEPTH CHARGES

Depth Charge Chart (Tab le 1) .......................................................................... 2In troduction ......................................................................................................... 3Mark V II (Mark V I I * , Mark X I I I ) ...................................................................... 3Mark V II (Heavy) .................................................................................................. 5Mark V I I I (Mark XI, X I * ) ................................................................................. 7Mark X (Murk X *) .................................................................................................. 11Mark X II .................................................................................................................. 15P is to ls Mark V I I , V I I * , V II*A , V I I * * , V II* *A , und V I I I ...................... 17P is to ls Mark V I I I * , V I I I * * , V I I I * * * , IX, IX *. IX ** , IX *** , X I,X I* , XI*C, and X I I I ...................................................................................... 19P is to ls Mark X IIIA , X I I I * , XIV, X IV*, XV, XVC ........................................ 21P is to ls Mark XVI, XVI*, XIX, XX, XX*, XXI ................................................ 27Primers (B oosters ) Mark V I I , V II No. 2, V I I I , VIA, X .......................... 27Primer P lucors (Booster Extenders) Mark I & I * ...................................... 29

CHAPTER 5

BRITISH DEPTH BOMBS

Depth Bomb Chart (Table 1 ) .............................................................................. 2Depth Bomb Fuzes (Table 2) .............................................................................. 2In troduction ............................................................ ............................................ 3Nose Fuze #32, Mark3 I I * and I I I .................................................................. 9T a ll Fuzes #895A, Mark I , #875A, #8?5B and #875C .................................. 11T a l l Fuzes #862, Marks I and I I ...................................................................... 11

Added 1 July 1945 (Change No. 8) -1 1 - COHFIDENTIAL

TABLE 07 CONTENTS

PART I I I - BRITISH UNDERWATER ORDNANCE

CHAPTER 6

BRITISH AHEAD-THROWN ANTI-SUBMARINE WEAPONSPage

In troduction .......................................................................................................... 3Hedgehog .............................................................................................................. 3Squid ....................................................................................................................... 3

CHAPTER 7

BRITISH CONTROLLED MINES

L Mark I (L Mark I I ) .......................................................................................... 3

Added 1 July 19^5CONFIDENTIAL - H i - (Change No. 8)

PART n


CHAPTER 5

BRITISH DEPTH BOMBS

✓

DECEMBER 1. 194-4 CONFIDENTIAL

5R IT ISH DEPTH BOMBS

B ritishDesignation

Tota lWeight( lb s . )

Type & wt. o f Charge( lbs.)

,Shape

Nose

Max.Dlara.

O vera llLength( i n . )

Fuzing Markings Status

MJc. I 100 45 KDX/TNT or

49 Torpex

Round 8.05 42 NoseFuze# 32

DarX green o v e r a l l , i "

Obsolescent

MX. I I 100 It It It It 1 " from 1 M

II

MX. I l l 100 N "It It " l ig h t^ r e e n

band 6If

MX. IV 100 « It It II T a il P ls to la *28 or #30

from nose. Early designs, yellow

11

MX. VI 100 ii Sec Note 1

II See Note 1

IIo v e ra ll.

S erv ice

MX. I 250 149 Bara to 1 or

140 TNT-

Round 11.2 59 Nose Fuze # 32 Same as

100 lb . c la s s ,

Obsolescent

MX. I I 250 !« I I II II II It

MX. I l l 250 It It It •t ft that l ig h t green band is 4£" from nose.

II

MX. IV 250 154 kdx/tnt 152 TNT

It 11.35 58 T a il P is to ls #28 or #30

Service

MX. I 500 291 TNT Round 14.0 74 Nose Fuze # 32 Same as

100 lb . c lasso r / * a n t

Obsolescent

MX. I I 500 It It It •1 « II

MX. I l l 500 508 Baratol n 14.3 76 •1 that l ig h t II

MX. IV 500 282 TNT It •1 72.5 T a ilPl3tOl3#28 or #30

sreen Dana is 6"from nose.

II

Me. I 600

1

432 Mlnol 439 Torpex

Concave17.5 56.7 T a ilFuzeif 0*?

Same gene ra l markings.

Service

Note -1. Attachment welded to nose to prevent r icoch et. Increasing the o v e ra ll

length o f 42 Inches by severa l inches.Table 1 - B r it ish Depth Bombs

B r it ishDesignation

Location F itted in the fo llo w ing bombs

Means o f Arming

Means o f F ir in g

Max.Dlam.

Length Status

No. 32 Fuze

Nose MX. I , I I , I I I ser ies .

A ir vanes. 200 f t . a t 100 m/hr.

Impact w ith delays o f 0 .5 ,1 . 0 , 1 . 5 , 2.0 seconds.

2?5 7'.'0 Obsolescent.

No. 30 P is to l No. 28 P is to l

T a il mx. r r, v iSeries.

A ir vane. 13 revolu tions

Impact with delays up to 113CCOnd3.

2?0 3'.'88 S erv ic e . # 28 is fo r land bombardment.

No. 862 Fuze

T a il Mk. I 600 lbs.

Arming w ire w ith drawn.

Hydros ta t ic Pressure 30 f t . depth.

2?0 5"5 S erv ice .

No. 875 * 895Fuzes

T a ll Mk. VI 100 lb . Mk. I 600 lb .

Arming w ire w ithdrawn.

Hydros ta t icPressure.

2?13 4V75 Service 895 is re p lacing 875.

Table 2 - B r it is h Depth Bomb Fuzes and P is to ls

CONFIDENTIAL -2

BRITISH DEPTH BOMBS

In troduction

I . The B r it is h employ fou r s izes and types o f depth boobs:

(a ) 100 lb . Marks I , I I . H I . iv and VI

( * ) 250 lb . Marks I , I I . I I I and IV.

(c ) 500 lb . Marks I , I I . I I I and IV.

(d ) 600 lb . Mark I .

2. Service depth bombs are o rd in a r ily fuzed In the t a l l on ly , although e a r l ie r models, now obso lescen t, employ only nose fu zes. In rare cases, both nose and t a l l fuzes may be encountered. Two methods are employed to obtain depth f i r in g :

(a ) Delay f i r in g detonators and powder tra in s .

(b ) H ydrostatic fu zes.

>. A l l s e rv ic e depth bombs are painted dark green o v e ra ll although e a r l ie r models are painted ye llow . A 1" l ig h t green band Is painted around the nose ju s t abaft an 0'.'5 red band.

k . The bomb cases arc e ith e r c y lin d r ic a l with round ends o r tear-dropshaped, and are f i t t e d with the standard B r it is h s in g le suspension lug on the top cen ter l in e . The 600 lb . Mark I may a lso be f i t t e d with double suspension lugs fo r use w ith U. S. a i r c r a f t .

5. The t a l l sections fo r these bombs consist o f a cone f i t t e d with four fin s mounted ra d ia lly a t 90° to each other and enclosed In a c y l in d r ica l shroud. On these bombs which take vane-arraed Im p ac t-fir in g t a l l fuzes, a c y l in d r ic a l vane extension rod extends from the a f t e r end o f the t a l l body through I t s lon g itu d in a l axis to the fuze tody in the bomb case. This rod serves as an arming sp in d le , the arming vane being attached to i t s ou ter end w h ile i t s forked inner end engages an arming nut on the fu ze . A l l t a l l sections are secured to the bomb cases by fou r spring c l ip s except in the case o f the 100 lb . Mark V I, the t a l l sec tion o f which is secured by four b o lts . The clip -secu red t a i l sections are designed to break o f f on impact with the water.

6 . The fo llo w in g genera l precautions should be observed when dea lin g with bomb3 o f th is type:

(a ) Obtain a l l p oss ib le in form ation covering the type o f bomb and the tyoe and cond ition o f the fuze or fuzes f i t t e d before attempting any d isp osa l operations.

(b ) Do not attempt to render sa fe unless abso lu te ly necessary. Des troy the bomb by countermining whenever fe a s ib le .

( c ) Do not move o r ja r the bomb unnecessarily .

(d ) Never move o r ro ta te the arming vanes.

( e ) When d iv in g operations are necessary, ra ise the bomb before proceeding to render i t sa fe .

( f ) I f a fuze is jammed in i t s pocket, make every e f f o r t to dispose o f i t by means other than withdrawal o r disassembly. I f i t is not fe a s ib le to ’ countermine the bomb where i t l i e s , i t may be more d es irab le to transport i t to a dem olition area fo r countermining than to attempt to render i t sa fe .

{ g) When d ea lin g w ith a bomb which has m u ltip le fu z in g , d ispose o f the nose and t a i l fuzes in that order.

(h ) Mine D isposal personnel should not attempt disassembly o f fuzes f i t t e d except as h e re in a fte r ind icated .

7. Rendering these bombs sa fe cons ists o f d isposin g o f the p a rticu la r fuze o r fuzes which may be f i t t e d . A b r ie f d escrip tion and operation o f each fu ze , together with the approved procedure fo r rendering sa fe , is included below.

-3 - CONFIDENTIAL

BRITISH DEPTH BOMBS

Fig. 1 - K *. I , I I and I I I S eries o r 100, F ig . 2 - Hk. I , I I and I I I S eries o ' 100, you end 500 lb . Depth Bombs, 200 and 500 lb . Depth Bombs,E levation S ectiona l View

-4 -CONFIDENTIAL

BRITISH DEPTH BOMBS

Locking------Screw

M ain__Charge

Suspension Lug

Pad

BoosterlContainer

LocationPin

Nose Plug Discs

T.N.T.

Pelt Disc

Auxiliary Booster

Feit Washers

Tail Adapter

Pistol

TransitBose

Fig. 5 - Kk. IV S eries o f 100, 250 and 500 lb . Depth Boabs, E levation

F ig . k - Mk. IV Series o f 100, 250 anc500 lb . Depth Bombs, S ectiona l V lev

F ig . 5

Pose M od ifica tion fo r Converting Kk. IV 100 lb . to Kk. VI 100 lb . Depth Bomb

CONFIDENTIAL

-5 -

Ship

ping

Plu

g Cl

osin

g Pl

ate

BRITISH DEPTH BOMBS

F ig . 3 - Kk. I , 300 lb . Depth Bomb, E levation

F ig . 7 - Mk. I , 300 lb . D epth Bomb v i th o u #-T a i l o r Nose Cap, S e c t io n a l V iew

CONFIDENTIAL 6 -

BRITISH DEPTH BOMBS

ARMING VANE

S A F E T Y STOP

NEEDLE STRIKER

ARMING NUT

STRIKER DETONATOR - DELAY RING DELAY TRAIN A D JU S TA B LE DELAY TRAINDELAY RING SPINDLE TENSIONING RING FLASH CHANNEL DELAY HOLE PLUG FIRING HOLECOV ER-------------RUBBER SECURING RING DETONATOR, 5 GRAINS H U T T E R ----------------------------STE M M E D FIRE CHANNEL MAGAZINE T E T R Y L GAINE —

INERTIADETONATORCARRIER

CHAMBERCLOSINGPLUG

GUNPOWDER

BASE PLUG

P ig . 8 - Hose Fuze #32 , S e c t io n a l V iew

CONFIDENTIAL

BRITISH DEPTH BOMBS

S ^B A N D OF B L A C K BUNT

Pig. 9

LEN G TH PAINTED RED

PAPER LABEL

FLASH HOLES

F L A S H CH ANNEL

OELAY COMPOSITION

PRESSED GUN POWDER

A S A . MIXTURE -----------

PRESSED TE TR Y L

HEAD

PERCUSSION CAP % BAND OF AUJM NUM PANT

No. Detonator, Mk. I , F ig . 10 - No. 53 Detonator, Mk. I ,S ec tion a l View Section a l View

F ig. 11 - T a l l P is to l 428. S ection a l View. (T a l l P is to l*30 is Id e n t ic a l except cor round-nosed s t r ik e r . ;

CONFIDENTIAL -8 -

BRITISH DEPTH BOMBS

Nose Fuze #32, Marks I I * and I I I

D escrip tion

1. Instantaneous or short delay Impact fuze Incorporating f i r in g delays o f 0 .5 , 1, 1*5, o r 2 seconds. The fuze screws in to a pocket In a booster conta iner which in turn screws In to the bomb case and Is locked by a s in g le set screw. A rubber washer and securing r in g make a watert igh t jo in t around the fuze body.

2 . The fuze Is 7" long and 2?2 In maximum diam eter. .

3 . There is no means o f determ ining the armed o r unarmed cond ition o f the fuze from an e x te r io r examination.

Operation

1. Armed by an a ir vane which ro ta tos the working parts o f the fuze through a gear tra in u n t i l the s t r ik e r and detonator are a ligned . Impact s u f f ic ie n t to crush the upper fuze body fo rces the s t r ik e r down onto the detonator. Impact with water o r any impact In s u ff ic ie n t to crush the upper body ig n ite s a delay powder tra in when In e r t ia causes a detonator c a r r ie r to move aga inst a s tr ik e r .

Rendering Safe Procedure

1. Tape the a i r vane to the fuze body.

2. Unscrew the fuze from the booster conta iner.

3. Loosen the set screw and unscrew the booster con ta iner from the bomb case.

4. Dispose o f a l l exp lo s ive elements.

T a l l P is to ls 128, Marks I I * . I l l and I " , and #30. Marks I I I * and IV

D escrip tion

1. Instantaneous, Impact p is to l ( fu z e ) , screwed In to a booster conta iner and locked by a c y l in d r ic a l lock in g r in g which en c irc le s the p is to l body. Although the p is to l operates Instantaneously upon Impact, a ".025 second delay detonator is o rd in a r ily used with the #2B p is to l and a 0.5 second delay detonator with the #30 In o rder to achieve depth f i r in g . These detonators are not a part o f the fuze proper and are f i t t e d lo o s e ly in to the detonator envelope In the booster conta iner.

2 . The p is to l Is 3?9 long and 2" in maximum diam eter.

3. The p is t o l is not v is ib le unless the t a l l sec tion o f the bomb Is removed. I f am ed, the forked arming nut w i l l not be present and the threaded s t r ik e r sp ind le w i l l be v is ib le .

Operation

1. Aimed by an a i r vane which unscrews the forked arming nut from the s tr ik e r sp ind le a f t e r th ir toen complete revo lu tion s . Romoval o f the arming nut leaves the s t r ik e r restra ined on ly by 3 creep spring which is overcome by in e r t ia on Impact.


1. Remove the t a l l sec tion ( i f p resen t).

2 . Unscrew the p is to l from the booster conta iner.

3. Remove the detonator from the booster con ta in er using a small-gauge w ire hook o r other su itab le means.

4. Loosen the set screw and unscrew the booster con ta iner from the.bomb case.


-9 - CONFIDENTIAL

BRITISH DEPTH BOMBS

IMPACT LOCK SLEEVE

STRIKER SPRING— ^

VALVE

DETONATOR

SHUTTER

PLUNGER

TOP CAP

IMPACT LOCK SPRING

STRIKER

STRIKERSLEEVE

DIAPHRAGM

BOTTOM CAP

SUB BOOSTER

F ig. 1? - T a l l Fuze *395, S ectiona l view

CONFIDENTIAL -1 0 -

BRITISH DEPTH BOMBS

T a l l Fuzes #895A. Mark I . #875A, #875B and #875C

D escrip tion

1. H yd ro s ta tica lly operated. #895A, Mark I f i r e s a t’ a mean depth o f 18 f t . w h ile #875A, #875B and #875C f i r e a t 18 f t . , 22 f t . and 50 f t . r e s p e c t iv e ly . A l l these fuzes' screw in to a booster con ta iner and are locked by a lock washer.

2. The fu zes are 4?75 long and 2’.'2 in maximum diameter.

3. The fuzes are op era tive unless the arming w ire is In p lace. However, they should be sa fe to handle I f out o f water.

Operation

1. The arming w ire is removed when the bomb Is dropped. As the bomb sinks, water en ters the fuze body. H ydrostatic pressure expands the diaphrapn which ra ises the f i r in g s le e ve , thereby compressing the s t r ik e r spring and operating a ro tary shu tter. This a lign s the d e tonator w ith the s t r ik e r . When the f i r in g s leeve r is es s u f f ic ie n t ly to a llow the lock b a lls to c le a r a sta tion ary s le e ve , the b a lls f a l l in to a recess and the s t r ik e r Impinges on the detonator.


1. Remove the t a i l sec tion .

2. Unscrew the fuze from the booster con ta iner.

3. Loosen the set screw and unscrew the booster conta iner from the bomb case.


T a l l Fuze #862. Marks I and I I

D escrip tion

1. H yd rosta tica lly -opera ted fuze w ith a f i r in g depth o f 30 f t . The fuze screws in to the booster conta iner; a rubber washer and securing rin g make a w a tertigh t jo in t around the fuze body.

2. The fuze is 5?5 long and 2" In maximum diam eter.

3. The fuze is op era tive unless the ansing w ire 13 In p lace. However, i t should be sa fe to handle i f out o f water.

Operation

1. The arming w ire Is removed when the bomb is dropped. As the bomb sinks water en ters the fu ze body. H ydrostatic pressure operates a shutter which a lign s *the detonator with the s t r ik e r . I t a lso compresses the diaphragm which fo rces the s t r ik e r down toward the detonator, thereby pushing the s t r ik e r leve rs down and the spring-loaded leve r-b lo ck s out. When the leve rs move past a p o s it ion where they make an angle o f 90° with the s t r ik e r , the leve r-b lo ck springs fo rce the blocks inward and the le v e rs snap the s t r ik e r down onto the detonator.


1. Remove the t a i l sec tion ( i f p resen t).

2. Loosen the lock ing r in g . Although considerable fo rce may be necessary to accomplish th is , the fuze is not s e n s it iv e to impact o r shock and the operation is not unduly dangerous.

3. Unscrew the fuze from the booster conta iner.

4. Loosen the set screw and unscrew the boostor conta iner from the bomb case.


-1 1 -✓

CONFIDENTIAL

BRITISH DEPTH BOMBS

RUBBER SEALING RING

LOCKING RING

RU8BER DIAPHRAG WATER CHAMBER

STRIKER HEAD

LEVER BLOCK

SPRING-

SHUTTER S P R IN G -

DETONATOR

MAGAZINE-^

WATER PORTS

STRIKER LEVER

"STRIKER

SHUTTER

SAFETY WIRE HOLES

SHUTTERBELLOWS

F ig . 13 - T a l l Fuse *8 6 2 , S e c t io n a l v ie w

CONFIDENTIAL -12

p a r t nr


C H A P TE R 6

BRITISH A H E A D -TH R O W N ANTI-SUBM ARINE WEAPONS

/

DECEMBER 1,1944 CONFIDENTIAL

BRITISH AHEAD-THROWN ANTI-SUBMARINE WEAPONS

BoosterPellets

Fuze Squid Mk I

Gas Check Ring

Tail Fin

•j >> -/./// * j» K i / « v rs£ -■5 :55

SQ:. :y MUf&r^ vr -S■J ;; ;* £ 5 3 $ $ $

J

c» S S K / ' i - - c A '

* ] YA'

/'

■ . .f ■

TN T Topping

Charge Minol

Fig. 1 - Squid, Sectional View

-2 -


In troduction

1. This chapter d ea ls w ith the B r it is h Hedgehog and Squid p r o je c t i le s , and the fuzes which may be f i t t e d to them.

2. A l l o f the fuzes are extrem ely s en s it iv e and dangerous to handle when armed. For th is reason they should be rendered sa fe on ly In extreme emergencies.

Hedgehog

1. This weapon d i f f e r s from the U.S. 7?2 Ahead-Thrown P ro je c to r Charge (Hedgehog) as fo llo w s :

(a ) I t s ca rtr id ge p rope llen t charge Is Cord ite ra ther than smokeless powder.

(b ) I t s high exp lo s ive charge Is In va riab ly Torpex.

2. Except fo r the changes noted above and minor constructiona l d e ta i ls , the weapon Is Id e n t ic a l w ith the U.S. Hedgehog. The fuze f i t t e d to the B r it is h charge is the No. 420 Mark I . I t Is very s im ila r to the U.S. Mark 136 fu ze.

3. For fu rth er d e ta ils and the approved rendering safe procedure, see Part I I , Chapter 6 . In step No. 1 o f the rendering sa fe procedure I t Is emphasized th a t, while ro ta tin g the arming vane to disarm, the space re ferred to should never be closed to a d istance less than about 3/l6".

S q u i d

General

1. Ahead-thrown anti-submarine p r o je c t i le .

2. Launched In patterns o f three o r s ix from mortar-type p ro jec to rs on the fo re c a s t le o f pa tro l v esse ls .

D escrip tion

1. Case

Shape

M ateria l

Diameter

Length with t a i l

Charge

T o ta l weight In a ir

2. Fuze, Squid, Mark I

C y lin d r ic a l, w ith hemisph erica l ends. F itted with h e l ic a l , finned t a i l .

S te e l

11?93

5675

207 lb s . M lnol.

400 lbs. approx.

(a ) Th is fuze, a combination lnertla-hydrodynam ic-clockwork f i r in g dev ic e , Is mounted in a pocket In the nose o f the p r o je c t i le and secured by a keep rin g . A small w ater-en try port sealed by a wax covering Is located on the nose o f the fuze along with a sa fe ty key.

(b ) The fuze may be set to f i r e at depths between 20 and 800 f t . by va r ia b le se tt in gs on i t s delay c lock . Automatic depth s e t t in g by remote con tro l is made by an e le c t r ic a l mechanism attached to the Asd ic. Recorded contacts on the Asdic are transm itted to the fuze through cables which are sheared upon launching.

Operation

1. When the p r o je c t i le is in serted In the p ro je c to r , the fuze sa fe ty key Is turned clockw ise 90° and then removed, thereby unlocking the In e r t ia - operated arming mechanism. I n i t i a l setback upon launching d isp laces an In e r t ia block which unlocks the hydrodynamic *rmln.>’ mechanism. The In e r t ia block Is locked in the anned p o s it ion by a spring-loaded deten t.

- 3 - CONFIDENTIAL

B RITISH AHEAD-THROWN ANTI-SUBMARINE WEAPONS

P ro te c t iv e

Wax S e a l

T.N.T.

B o o s te rP e lle ts

R in g

C h a rg e

F ig . 2 - Fuze, Squid, Mark I , S ectiona l ’ 'le v

F ig . 3 - Fu ze, S q u id , Mark I , S e c t io n A -A

CONFIDENTIAL -4 -


"Squid" Cont.

Impact w ith the water breaks the wax sea l on the water en try port a llow ing water to en ter the fuze body. Hydrodynamic pressure operates a rotary sh u tter which a lign s the detonator with the s t r ik e r and booster, and s ta r ts the delay f i r in g c lock .

2. The fuze and p r o je c t i le f i r e when the clock runs o f f I t s delay s e tt in g , re lea s in g the s t r ik e r to Impinge on the detonator.

Precautions

1. Note that there Is no p o s it iv e means o f determ in ing the armed o r unarmed cond ition o f the fuze from an e x te r io r examination. However,I f the wax sea l on the water en try port is broken, the fuze has probably armed.

2. Do not move o r Jar the p r o je c t i le except from a safe d istance. The fa c t that the fuze f i r e s by a c lock delay makes i t extrem ely dangerous.

3. Never attempt to render the p r o je c t i le sa fe by removal o r disassembly o f the fu ze . Countermine the p r o je c t i le whenever fe a s ib le . In extreme emergency, thenn lte burning o f fe r s a poss ib le so lu tion to the d isposa l problem, but I t cannot be recommended.


1. None known.

Spindle

UnlockingPlunger

JnertioPlunger

■Safety Key

Connection Rod

Fig. i* - Squid In e r t ia Arming Mechanism, S ection a l view

SylphonBellows

Connecting

Spindle

Rods

F ig . 5 - Squid Hydrodynamic Arming Mechanism, S ection a l View

-5 - CONFIDENTIAL

PART n


C H AP TER 7

BRITISH C O N TR O LLE D MINES

DECEMBER 1,1944 CONFIDENTIAL


Cover Bung

P ig . 1 - L Mk. I I Mine, S ection a l view

CONFIDENTIAL -2 -


L Mark I ( L Mark I I )

General

1 . Moored, con tro lled mine.

2 . Laid by surface c r a f t .

3. D efensive mine, used prim arily fo r harbor p rotection .

D escription

1 . Case

Shape Two hemispheres, jo ined by a 6?5 c y lin d r ic a l m id-section.

C olor Black

M ateria l , S te e l

Dlamoter 3875

Length 50" approx.

Charge 500 lb 3. TNT o r Amatol/T o ta l weight In a i r 1100 lbs. approx.

2 . E xternal f i t t in g s

Cover p la te In cen ter o f upper hemisphere, secured by b o lts .

Base p late In cen ter o f lower hemisphere, la p - f i t t e d , secured by b o lts . F itted with gland In cen ter fo r f i r in g cable.

Cover bung In cover p la te , secured by keep r in g o r strongback and screw.

P ro tec t iv e cover Shaped lik e sec tion o f truncated cone, f i t s over top o f case.

L i f t in g eyes Three, on upper hemisphere. Mine recovery chain is suspended from two eyes.

3. The L Mk. I I d i f f e r s from the L Mk. I as fo l lo w s :

(a ) I t s p ro tec t iv e cover does mine.

not com pletely enclose the top o f the

(b ) I t Is not f i t t e d with a base p la te,

(c ) F ir in g cable gland Is f i t t e d on lower hemisphere.

(d ) I t s diam eter Is 40".

Operation

1 . Mine Is armed manually p r io r to lay ing.

2 . An observer f i r e s the mine e le c t r ic a l ly from a d istance.

3. No se lf-d isa rm in g dev ices are f i t t e d .

RMS (L MX. I )

1 . Cut and tape the f i r in g cable lead.

2. Remove the p ro tec t iv e cover and cover bung.

3. Cut and tape each detonator lead separa te ly .

Remove spring c l ip re ta in in g the booster.

5. Turn detonator and booster to r ig h t and remove from bayonet jo in t .

6 . Dispose o f detonator, booster and charge.

- 3 - CONFIDENTIAL


F ig . 2 - L Mk. I Mine

F ig . 3 - L Mk. I Mine, F loa tin g

CONFIDENTIAL 4


L Mark I (L Mark I I ) Cont.

RMS (L Mk. I I )

1. Cut and tape the f i r in g cable lead .

2. Remove cover bung.

3. Reach in and remove the rubber box connector from i t s c l ip .

4. Press booster re ta in in g pawl Inward and withdraw detonator and booster.

5. Dispose o f detonator, booster and charge.

P ig . 4 - L Mk. I I Mine

- 5 - CONFIDENTIAL

part ni british underwater ordnance disposal handbook, part... · 2020. 11. 17. · (h) mine...

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