TABLE D. 
Experiments with 80-ton R.M.L. Gun. ifkpl. JVc/.^jp. Calibre, 15 ins. Chambered to 16 ins. Comparative rounds in unchambered bore in italics. 
THE 80-TON GUN, 
471 
Energy. ! 
Per inch of 
shot’s cir¬ 
cumference. 
At 
1000yds. 
diO«®MBNO®OHONNNI> iH ?>.© ?>-rH Mp© *0 1 ®©© © MP© °0 i® ©l © *0 © «0 
8 —iHs©S>MibMiCOMi*®mM<Miira rtONVCOSieOStl^lOIM QC'OOCn Os© OH 91 
-w Mi -cPMi spMi M-M* M-Mi -crMi ^ Mi M< Mi sj-Mi mpmi -cPMi npmi mi M* © go © Go Mi sPMi mPM -cp 
«e 
At the 
muzzle. 
m 
§ >® V IN ®» © Os Ml >0 in CO HOW OOO 3>-MI Mp© O 0 00 SO © rH Osin Os CO Os rH >0 © Mp 
S,NN»« 0 h 90 OO(O'(.NHhM N«mN2fltiOOsONO Ml So in -CP© 10 Ch ISO 
• Mi mPM -ct-io sj-rn M-m *o m m m m mi -cpmi spmi spin M-m mm mi mpMi -cpmi -ms- mji -cpm 1 sj- 
Ch 
Total. 1 
At 
1000yds. 
2 © t--m *n© -cpm o Mi ®i m m © m oi®(0'so^i>® | otMoo mi ifc © oso 8»®'om>3 
3 'O Osh jt-o o m Nifi m ^ sf ® on Nm^n Nm®io oom«3©5ffl'ON«3 
OMi S) OS *N© O CO ©^©^©^Ml Mi © V^© *0^© 130 m Go^ ©_© 1® rH ©^ CO Np ©^ 130 <?4 Sp © 'CO 
®T oscT os o' o' o' o' ©" v i-T o' o" r-T oT o^o" ©5©" dscT o' o' h o' 00 " i>o" ©" 1*0 ©" 130 cT ©5 of bs 
,£jrH>i-IV©®*©©l© l S*©:sJ©© rH\,rHH.©H.©©)©©© rH'NrH>rHVrH'?.rH'N 
© © 
£ s 
^ a 
2 m 0 mh sj qo *0 co m 0 co 0 0 co oooo««jo<oo®o o'ooajouooa!) 
Pi Mi i 3 o © oso oso © © © C3 m © <33 m M-o son 9)NHh 01 J-s.© t^© vpoc ooco 
0 © 0 qo ioojooco &j^co osom ojh Jn.io go oo m m ® i«co on «:o s»ho 
. © ®T of ©f ©" ®f ©" ®o co -mm"© co m" ©" vT ©" ®f ©" ©f ©" eo © m" cef 0 " o' i-T \T r-T >" c<f ®f ©" ®T 
„+=©©(©«!©©(©©<©©(©©©© ©®l©©(©©3©«(©©© ©®I©®1©©!©®!©®1 
jo jojob^ 
^ >oo rH p.© os© QNooN co OsOO ©sM p 03 m co <33 90 © <no3 t^m p*o oo 
2 §3 03 ■so os do -m ir^oot^.do do t- 1 * tb do b. jo n® in in. ®ib©b©®(©eo©b 
^ycao'Qooo'Oooc'OooD'Ooczj'OoooQoooao .oo'coco'oooo'oooo'aocioooao oo'Boaooooo'aoao'Oooooo. 
bD 
$ 
a 
•quretp’jpd 
UO 9JUS 
-sgjd weani 
JO UOJ J9J 
2O®»O , a0OOOO6ooOOO O'OoOOOOOOOOO O po O O tjp o o o p 
oOON'CN 000'00 v 003'rfido - rji Q *3 ^ ®C ® O ™ S» 6 ^ 03 03 ®0 05 ®0 CH ©? O i© 00 > 
-S-m 'Oooo®5iNiCiooa3tNN- m'EorJOooomtv.-Hmm o OsO v 03 Osm > co <0 
.0000^0000000300 O OsO OfflOO OsO O O O OsO O 03 OsO o o o 
• japjiod jo 
punod J9<j 
§ co osco '0orfioo3eooooooo oo Oeo psoo >N^yi®o ® >9 o® psrH 00»p 
+= m 'cj-dfi ioi^baiooifflo) sPm ®)cn>iHbo3dorH 63 bsos iNOio® p 
+ 3Q0'00 00'00 00 O0 00'<>0l''iOt'lNlNI>. OO'OOQO'BOCO'CoOO'SOInJNOO tH l^-£> C^t> i'-l'r iNN. <N 
Total. 1 
Keal- 
ised. 
“mo^fi®ioo*oco*omc)coooco ooo^m^ooioocoo 000 ioo*30oos! 
PI Mi '00 CO Os 03 Os© OCDOOilOCO© in NP© OON-VMI^lCslTflrH Si CO M Hpoo so © oo 
ONO®*Offl , 3o®6i®V'P®®'? O«0U3»3HN®»3®'|® ®»3COONIOO SiHO 
-nT ®r C-f ®f co ®T co" Gl® 1 co" -CprfT -o' CO Hi" cl' Ni" ®T CO ©)" Co" 5 ®" eo" Hp" co" ©" 0" rn" \T rH >" esf of csf ®f 
.H.(-q©(c<je3(rsi®ts<i®ic<j®*!Mni<M5si oq®<cq®icn | 3^cs)e»csjcci(M cn®*csi 6 )cci®!nj®(esi®( 
Theo¬ 
retic. 
“OOCOOWONSOOCiHOOH ©OcoO®CiN«OOHN OOpOWONSJOO 
9 © *0 CCI l© © -M-© OsCO OSCO ©©CO ©lOCM'O© Np© Os© © © © >0 03 © Np© Os© ps 
0 Si 120 © 'Cp(M O N Sj ©®3©W©© 03130© 'CplN OC-lO©©!^ ©OoCO^ MN 'ptN *0 CO 
. mT v-p icT >o" ©" so" ©" so" in" eC iC tn iC s^i" sfm"io©" v b'©"io"tN'iN'co H."rj:ira'u5"©'b'©"so"t>'N^ 
,+3cci®i<Nl®ICsl®l(M®i(?q®iiM(M(?sl!M (M ©1 GO ©( CM S* C-5 CH (M CM cq®*<N©)CN®tm®<<NI®J 
Mean 
pressure 
on powder 
chamber, 
.4,1, 2, and 
3 gauges. 
m A 
o <©'? v® m rH co oo © p n eo in p 03 ni ni msp oo i^cs p.© osoo © 
•Hcn©brH\.c<i>-'M®}(jq 43 ni 4 ji( 3 qcn d-ibdq®(cb®i<P 3 Hpoci ©<jq oohoh^onh®) 
• EjiM^icsi^icsjsiffqsecsistcsicsicsjcsi c^®i(M®icNi®»n 3 ®(ssi(M« c<i©iffH®<eci©f<M©icsj®! 
Pi 
Maximum 
pressure. 
<M sp CO > 
• n® tJ tS 
’o 55 Pi | g 
aj-9<i rCP-<'^rH'^l<^Mi<l<j <1 eo <! ^ <1 ^ <1 <1 on <1 V <1 ^ <J V. oq ^ rH 
o ^ lis "e ^ "s ts "e ts "e ta "e H ^ "a "es 'cs "e *§ Is <s « "§ Is la "e ^ ^ e ta "S 
. ^C^'Joip'O^'pOCO'^-^ O CO ^ CO ^ loioipv^joo ip <p ip P Ip 0 ) <p > rH pNl> o 
^H^cqeo^'joco'oco'^oo 
© 
Velocity 1 
•spioOOI 
IV 
. r# oo na -cPm ®o m eo n. o eo © © h t^'Ncu'OorHOoeo'onjrHoi n^nNnnwiPotN 
m ® nc Os® odp.iM'ct'mMcom n n© «o h ©sm v m m n © go m *«P© so o. oo e- ©s 
CO ®0 if GO ■efi HpMi Mp-^i Np^fl Mi Mi ■<# © GO © GlJ ■>? 60 -^i -cP-Si Tp Tp ©G 0 ©G 0 ©IS 0 COG 0©60 
• H>H>H>HpHPHHi—IrH rH>iH>tH'NrH'NiHrHrH r-iS f . r H’>t.rHViHViH> 
‘ajzznta jy 
1 .© HJ-© > r# > M< s> © O © OCl m rH © SO © 'CP05 lO CQ 10 rH rH rH HP ®0 © O © SO P m 'CP 
co © ?s^© Os© o © h-© Hpm © © m inso © ®o © Os© >. © m © ci ®<hi -cpffl on'Son Os 
CH ;MP'cpHi'cPmiomiom>0'ommm -P -cphi -cpm Hpm o m®io Hfi'cp-^i'cpMP'cpH''cP'^i'CP 
HVH>HVH>H>HHHH i-HVrHVr-HVT—1 \>i—I H H 
•jqSreM. jbjo j, 
•0[I^O9 Co JJ 
WSOffiSO-soPsoOsOiON®® ©'0©S0©'0©'0©©© ©'©©'©CD'O©'©©'© 
© so © so N. so © so © SO © © © © so © SO © so co SO © © © NO NO ® O ® O ©O 
P^^SpMj^-Ml'Cp'^fi^-Mi'Cp-HMiHP^t 'Hi'CpMi'CpMi'CpMi'Cp'Hi'^ii#l TpHpsflrcprp scPHP Np Mi NP 
Charge. 
*qj jad 'sue 
inoiqha ‘ 
M 05 OJ r, OO 05) C5) CO 05 CO 
•H(NiprrPrHp©p©p©©©© NOhOhOOOOOO ©OhO _ OOOpO 
‘8©oo3 b©b©o©b©©©© ©bo30©b©b©©© ©besb© bs© bob 
O©G0©G0©e0©G0©G0©©©© ©90©®0©GO©GO©©© ©60©G0©®l©G>3©G0 
•SuipBcq 
J9JJB qj^uaq; 
. 1 ®!P *oo io<o*o»o 
CD © P O t^© 090 «N© lOt^p-frHlN OOO ?N© ®0 rjl Oo 
.g © sp © <n© bsdfi v©b©©cb© ©so© t^© bs-ip > © © -^i © sb © K© i^-sJi > © b 
Mji -Cprfl scprji "Hp-rfi >0 sp *0 sp sp Mi Mi -Cpspi 'Cps# sepM? 10 Mi HP -^i M -CpMi NpMi HpMi <0 Hp *0 
•OOOOOOOOOOOOOO ©Q>©0©0©0©©© ©0©0©0©0©P 
P®On ?N© Oo Si Os© OhOOh ©SON ts.© 130 Si Os© rH © fflON 3 n.© 00 © Os© O 
■— '©®1©Q)©®1©®IC060(JOOTCOCO ©®e©<5)©®)©®!©©© ©&(©© 1 ©®!©©*COGO 
Description of 
powder. 
t f 
Jl O.S J 
* ^ 
S a«R«its = aa * . CO X aaaaaaass aaapaaaa 
.. Go’S odj$ 
O* v 0 ~ n® .§ ©‘g 
® §S ^ 
4& 4 . 
V s A, Y 3 ~ in 6 ® 
r H '- ! S aaaaaaaaa .-adsaaaaaaaa .^aasafeaEa 
.« P3 4cs PI - 
•« S b 
of PC? 
3 « 
•punojj 
^5 ^ «}— 
© ®o © »o © o> in 03 © rH ©co Mi Os© ©( © oo cd © © m 00 © o h -cpM* ost> > 
© ®i © ©» © ®i m< eo Mi eoMi m © sn © sn m» ®i®i Mi m m © \> © ©i Mi ®t Mt M* eo 
Fired with axial vent, t I n round 24, shot accidentally rammed too far. 
