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Handbook of the Ordnance Q.F. 18 -PR ... (LS) 1940

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Ltd., Melbourne (Prinred In Australia) :,.":,,,~:;i c' ff.1,.'"",;',~;£.~~ff;;"~ ",~~,: ,,;iN; ~~: I.'~m;~~f,.~ 208 -E ~ e ~OJ ~ .d ~. ~." ..~ ~ ~ .~~ ~ ~ It) c= .d~ ~.~ ~ ::~ ~ ~:: 0:; .ff) ..~ ..~ ..: : Q~ C-I .~~ -~ ~ - .~ .'- ..~ .. ~ .s ~ C-I Cl ~ ~ ~ ~ ~ ~ N ~ :-0.;:.-:->.- ;;. ~ ,.::>,.: :> > ~ bO cd ~ cd cd.~ -,.:-..,.:..~ ".~..". ,.:~.."-.. .. ~ ~~ ~ >. ~ 0 N ~ O~ 0 > 0 ~ =' -~- ~ cd ~ .. ~ ..I." "".. 0 0 00 0": 0 ~ co r-. <0 r-. 0 00 0 0 0 0 0 -0 - ~ ~~ : :~:~ ~ ~:: - :- : :- : :- : : : : ci () ci ci ci ci 0" 0 0 0 Z ZZ Z Z Z Z -- ~ z z z ~ > > > > ~ ~ ~ ~ ~ 00 5 '0 '0 '5: ~ .c""'"0 ~ 'Qj ~ ~ ~ ~ ~ ..: .~ ~.~ .~ . ~ z ot U) ~ ~ ~ ~ e""'"0 ~.. ... .. ...0 ' '"~ >.>""».>0 0 0 >. ~». 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'-"-'~""-' rxJ. ~rxJ.~~'~!;;' ~A "'~""-;AAA'c::?~'c::?~ "";r-.'~'r-:aS ~ ~~~~ 'C!~'C!~~ ~ 'C!~~ Q QQQQQo. ~ ~~~~ ~ ~ ~ ~ ~ ~ ~ ~~~~~~ ~ ~~~~ ~ It) 1t)1t)1t)~ It) It) It) It) It) ~ Of) Of) Of) Of) Of) Of) (£) (£)(£)(£)~ (£) (£) (£) (£) (£) ~ CD CDCDCDCD/DCD (D (D(D(D(D (D ~.. ~ cIS ; ~ ).: >. >. = = < < tt5 --C') Q ::. <0 C'! 0 .. 0 'C ~ a. :a 'g, ~ ] ;E 'ii ~'" .. .£ ~ <0 -Q .0 ~ Z m ~= ~ ~ ~ ~ . ~ ~ a. ~ a. .~ a. ~ "ic e 'g, ~ g ~ I .0 .~ cn ..== a. ~ ~ :t: - A ~ 'ii ~~~ ~ :Sa... ~ ...'5.£ 0=- -< ",'~ ~ U ~C'!'~ gO)g mC'!:.~ OIm.o ~._p. a.~~ Wi'8 ~a.-y- . .a. 0 N~ 0, ..Z ""a.'"'=~>~.0)'"'0 8""~e '2a...< ~~o.. .o~'"'o0 a. '"'1-4 ~ §'~ Z =-~0"""1-4 .~ ~:;~~"'- bOa.a.~;E bO== "..a.== ~~~a. ~~m~ I ~~~~'"yy~", ~~~~ ~~~~ 211 f/J Iz1 004 § Iz1 0 ~ ~ 212 GENERAL Ammunition for the Q.F. IS-pr. gun is of the fixed Q.F. type, comprising a primer, propellant charge (in a brass case),projectile and fuze, all of which are issued,stored, and loaded together as one complete round. Under peaceconditions some natures of shell are issued and stored without fuzes, plugs being used instead. These shell are fuzed before practi(;e. The name cartridge is given to the completeround (Fig. 92). Cartridgesare issuedin boxes containing four rounds. The time and percussionfuzes used with shrapnel, when in the projectile, are provided with a brass cover, solderedon, to protect the fuze from deterioration due to damp. 'Fuzes when issued separatelyare sup- plied in hermetically sealedcylinders, which should not be opened until actually required for use. FIG. 92 The propellant chargesare usually grouped according to their ballistic properties; the Group Letter and No. is stencilled on the rear of the cartridge case. The. propellant chargesare normally of cordite. N.C.T. charges were used considerablyin certain war areas and may still be met with. The cartridge being of the fixed type, there is no facility for varying the charges; consequently,the normal cartridge is the full charge. For practice purposes,or for use on servicein hilly country, or when considereddesirable to reduce wear of the gun, certain reduced cartridges are made up and issued. These are specially marked to avoid confusionin their issueand use. The table onpages 208 to 210shows the cartridgesnow in use with this equipment. PRIMERS PRIMER, PERCUSSION,Q.F. CARTRIDGE, No.1 The Mark II primer (Fig. 93) consists of a body, percussioh cap, anvil plug, copper ball, screwed plug and brass closing disc. The body is of metal provided with a flange in front of which it is screw-threaded externally to screw into the base of the cartridge 213 case, and two slots are cut in the flange for the No. 27 key. The interior is bored, cupped and threaded, to take the percussion arrangement. The cap is of copper, and contains detonating composition, covered by a tinfoil disc; it is placed in a recessin the body, and over it an anvil plug is screwed,having a conedseating, into which is placed a soft copper ball. Three fire holes are bored through the anvil plug to allow the flash from the cap to pass into the cone seating. The screwed plug screwsin on the anvil plug and retains the copperball in position; it is perforated by three fire channelsand is covered by a paper capsule,to prevent the powder working into the ball seating. A fillet of cementis placed betweenthe cap and body to prevent the ingressof damp. FIG. 93 The magazine of the primer contains R.F.G.2 or G.12 gunpowder, covered by a brass disc; this disc has six radial slits and a hole in the centre to weaken it, and has a paper disc secured to its under side with cement. The brass closing disc is secured in position by the metal of the primer being burred over it, and it is coated with cement. The primer is marked, as shown on page 245. The primer is issued assembled in the cartridge; in addition, spa,reprimers are issued in boxes containing four, to replace missfired primers. The letter M after the Mark indicates that the primer has been repaired and refilled. Action When the striker of the firing mechanism is driven by its spring on to the cap, the composition is ignited on the anvil; the flame 214 passes through the fire channels in anvil and plug, to ignite th,e gunpowder in the magazine. The magazine explodes, opens out the closing disc and ignites the propellant charge. The explosion of charge and magazine forces the copper ball into the coned seating of the anvil plug, closing the fire channels and preventing the escapeof gas at that point. The wall of the primer is pressed outwards to grip the cartridge case tightly, and prevent gas escape b~tween the primer and case. PRIMER, PERCUSSION,Q.F. CARTRIDGE,No. 11 The Mark I primer (Fig. 94) differs from the Mark II No.1 Q.F. percussion primer principally in having a magazine screwed into the body. It is of brass, rounded at the front end and perforated with eight holes, a white metal dome being inserted at the front end. FIG. 94 A paper envelope is fitted internally and the magazine is filled with six drams of G.12 gunpowder. The Mark 1M is the Mark 1 repairedand refilled. The Mark IMR is the Mark 1M repaired, the anvil and plug being of increaseddiameter. PROPELLANT CHARGES The full charge(Fig. 95) consistsof a bundle of M.D.S, R.D.B.S, W.O52, W.O54 or W.S cordite, recessedat one end to fit over the primer and the bossof the case,the other end being in contact with the shell. The cordite sticks are securedin two placesby shalloon braid. The weight of the chargeis lIb. 6 oz. 15 dr. With R.D.N./ A.040 cordite, the weight of the chargeis lIb. 13 oz. S dr. The charge for the streaIriline shell is generally similar to the above, exceptthat Mark I.I cordite is usedfor the M.D.Sand R.D.B.S 215 charges,it alsodiffers in weight slightly and in the tying of the sticks. The weight of the chargein this caseis lIb. 6 oz. 4 dr. The reducedcharge consistsof a bundle of M.D.2! or R.D.B.2! cordite having a cylindrical core of IO'4-inchcordite sticks, secured in two places with sewing silk surrounded at the base by a ring of 4.I-inch sticks, tied in two places with sewing silk; the whole is arrangedto fit over the boss of the caseand the protruding portion of the primer. The weight of the reducedcharge is 9 oz.
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