| Fred T
Jane's Naval Artillery Equivalence Table
| Gun Classification |
Muzzle Energy
(in foot tons) |
Britain
Armstrong, Whitworth, Woolwich |
France
Canet, Schneider |
Germany
Krupp |
Russia
Obutchoff |
Spain
Hontario, Ordoņez |
U.S.A. |
| A |
circa > 20,000 |
17", 16.25",
13.5", 12" (wire), 11" (Elswick 42 cal.)
(= 43.2cm, 41.4cm, 34.3cm, 30,5cm, 28cm) |
37cm, 34cm, 30cm, 27cm
(= 14.5", 13.4", 11.8", 10.6") |
35.5cm, 28cm (40 cal.)
(= 14", 11") |
30.48cm
(= 12") |
32cm, 28cm
(= 12.6", 11") |
13", 12"
(33cm, 30.48cm) |
| B |
20,000 to 14,000 |
12", 10", 9.2"
(wire), 12.5"
(= 30.5cm, 25.4cm, 23.4cm, 32cm) |
42cm, 24cm (40 cal. - 1893)
(= 16.5", 9.4") |
28cm (35 cal.), 24cm (50,
45, & 40 cal. - 1896)
(= 11" (short), 9.4" (long & medium) |
30.48cm (30 cal.), 20.32cm
(35 cal.)
(= 12", 8") |
- |
10" (35 cal.)
(= 25.4cm) |
| C |
14,000 to 6,000 |
9.2", 8" (15 tons),
8" (14 tons), 12" (old), 11" (old)
(= 23.4cm, 20.3cm, 20.3cm, 30.5cm (old), 28cm (old) |
27cm (1884), 24cm (30 cal. -
1884), 19.4cm, 19cm (45 cal. - 1887)
(= 10.6", 9.4", 7.6", 7.5") |
26cm, 24cm, 21cm (35 cal.)
(= 10.2", 9.4", 8.3") |
30.48cm (old), 28cm, 22.86cm (35 cal.)
(= 12" (old), 11", 9") |
24cm, 20cm
(= 9.4", 7.9") |
10" (30 cal.)
(= 25.4cm) |
| D |
6,000 to 2,000 |
8" (14 tons) (old),
6", 10" (old), 9" (old)
(= 20cm (old), 15.2cm, 25.4cm (old), 22.8cm (old)) |
16cm, 15cm, 14cm (28 cal.),
12cm (80 & 60 cal.)
(= 6.3", 5.5", 4.7") |
24cm (old), 21cm (old), 17cm, 15cm (27 cal.)
(= 9.4" (old), 8.3" (old), 6.7", 6") |
22.86cm (old), 15.24cm (33
cal.), 20.32cm
(= 9" (old), 6", 8") |
18cm, 16cm (35 cal.), 14cm
(= 7", 6.3", 5.5") |
6"
(= 15cm) |
| E |
2,000 to 800 |
4.7", 4", 5",
7" (old)
(= 12cm, 10cm, 12.5cm, 17.8cm (old) |
14cm, 12cm, 10cm, 9cm
(= 5.5", 4.7", 3.93", 3.54") |
15cm (19 cal.), 12.5cm, 10.5cm, 12cm, 8.7cm (50 cal.)
(= 6", 4.8", 4", 4.7", 3.4") |
20.32cm (old), 15.24cm
(old), 15.32cm (old)
(= 8" (old), 6" (old), 6.1" (old)) |
16cm (25 cal.) (old), 12cm
(= 6.3" (old), 4.7") |
5", 4"
(12.5cm, 10cm) |
| Z |
800 to 500 |
4", 3" (12 pdr.)
(= 10cm, 7.6cm) |
9cm, 7.5cm, 6.5cm (80 cal.)
(= 2.9", 2.5") |
8.7cm (40 cal.), 8.4cm, 8cm, 7.5cm
(= 3.4", 3.3", 3", 2.9") |
10.6cm
(= 4") |
- |
Old smooth bore guns |
The armour fitted to ships was similarly classified by
letters, with each lower case letter corresponding approximately to the thickness of
armour that the gun with the same upper case letter was expected to penetrate at close
range in actual combat.
| Armour Classification |
Harvey Nickel Steel Armour |
Harvey Steel Armour |
Compound Armour |
Iron Armour |
| a |
= 8" |
= 9" |
= 11" |
= 17" |
| b |
= a little inferior to the
above |
= 14" (approximately) |
| c |
= 5" |
= 6" |
= 9" |
= 12" |
| d |
- |
= 4" |
= 6" |
= 8" |
| e |
= thin armour |
Key
| cal. |
= |
Calibre |
| pdr. |
= |
pounder |
| ton |
= |
20 cwt. or 2240 lbs. |
| wire |
= |
Wire wound barrel |
Š
Robert George Cordery (2005)
|