SHORT NOTES ON PROFESSIONAL SUBJECTS. 
161 
Friction Tube. —The friction tube is of quill, at the open end of which is choked 
in a short piece of quill containing the detonating composition and a wooden plug, 
through which passes a brass friction, its outer end terminating in a ring, its inner 
end being turned back. 
The Lanyard. —The lanyard has two branches, one end in a loop which is laid 
over the tangent scale; and thus during the service of the gun the lanyard is 
permanently attached. The other branch, which has the hook at its extremity, is 
provided with a loop which is hooked on to the bearer pin or hook, and thus 
provides a similar arrangement as in the British naval service. 
Rapidity of Fire.— It is considered that this gun can be properly laid and fired 
at the rate of one round per minute. 
Penetration. —No data are given as to range or elevation, and little as regards 
penetration, but it is calculated that the chilled shell will penetrate at 500 yds. a 
target having 8 ins. of iron, with teak backing of 10 ins. thickness, and double 
inner skins, each of f-in. iron. 
Loading. —After loading, the loading-box must be withdrawn, to allow the 
wedge to be screwed home. The withdrawal of the wedge and clearing the vent 
are performed during the running up of the gun. 
The Gun. 
Breech or muzzle-loading.. 
Calibre ... 
Grooves, number .. 
Pitch of rifling . 
C over all. 
Length ...of bore .. 
(.of rifling .... 
Breech preponderance...... 
...lbs. 
B.L. 
8'44 
80 
2°38 / 42 , 6 // , or 
lin 68 cals, for 
driving edge. 
•188*64 
162 
126*38 
0 
f 180,16*81b.in- 
Weight of piece .cwts. eluding vent- 
(. piece. 
Material and method of con¬ 
struction . Cast steel. 
System of breech-loading. Wedge. 
Initial velocity with battering or f 12 ?13!Lfed 
highest charge.ft. per sec.^ 
JWof&e. kZlir 
Ammunition. 
Com. shell 
Battering 
shell or shot 
fdiameter ..ins. | g.^ 
length. . „ 20*59 
I weight, filled...lbs. 174*16 
^bursting charge „ 11 
(material ... Chilled iron. 
1 e Q* A A. 
diameter .ins. 
8*44 
8*1 
E hlf eri h e d^ h t.fflied:::ibs s : 
shellorshot^ bul .|^ gcllarge;) 
Battering or highest charge 
of powder ... 
Service or ordinary, do.. 
20*59 
277*15 
2*42 
37*48 
30*86 
