Figure 16: Kaga in 1942. (Scanned from Jentschura et. al. Warships
of the Imperial Japanese Navy, 1869-1945)
By process of elimination, we are left with the Kaga. And as it
turns out, there is important photographic evidence that comes out
strongly in support of Kagas case. Kagas starboard bow
25mm battery (S#3, S#4, and S#5) can be eliminated because the mounts
located here do not form a gallery, being individually sponsoned
out from the ship (this is shown nicely in Figure 4, presented in
the earlier Japanese Carrier Equipment section.) This
leaves the aft galleries.
Most of the gun tubs in the aft galleries are problematic. Like Sôryû,
Kaga also Type 95 directors located very near some of her 25mm tubs.
Drawings differ as to how close, with some drawings (notably the illustration
of Kaga in Gakken #14) showing the guns and directors in separate
tubs, albeit jammed right next to each other. Another source, Hasegawas
Nihon no Kokubokan, suggests that the two tubs were actually merged
to form a hybrid tub. This tub has an unusual shape, with a bulge
towards the forward part of the tub that housed the Type 95 equipment
(illustrated in Figure 17). This hybrid tub arrangement seems to be
supported, at least for Kagas port gallery, by close examination
of the photograph in Figure 18, although it is difficult to tell for
Figure 17: Hybrid gun/fire-control director tub aboard Kaga.
Yet the wreckage photographs seem to support the idea that both of
the gun tubs on the bottom were fully semi-circular in nature. This
indicates that they could not have been hybrid 25mm/Type
95 tubs. That, in turn, requires that we locate two pure
semi-circular 25mm tubs that are adjacent to each other, and which
have a gallery structure extending both fore and aft of their position.
This new requirement rules out Kagas port gallery. On that gallery,
hybrid gun tubs occupy the two middle
positions of the four, meaning there are not two adjacent pure
tubs to be had. This leaves the starboard aft gallery as the only
structure aboard Kaga that has a chance to satisfy the requirements.
We are, so to speak, down to our last nickel.
Fortuitously, the two forward tubs (S#8 and S#9) in the starboard
gallery, according to every source we have at hand, are purely semicircular
in nature. Furthermore, the gallery structure in this area runs both
(towards the 127mm battery) and aft (towards mounts S#10, S#11,
and S#12). There is a nice separation between tubs in the area.
The question then becomes, does either of the two forward tubs contain
a landing light array that will match the wreckage?
The photographic record of Kaga is nearly as weak as Sôryûs.
However, there is a surprisingly good overhead shot of Kaga available
(Figure 18) which shows her flight deck in some detail.
Figure 18: Kaga,
photographed in April 1941, showing her flight deck and anti-aircraft
galleries. (Scanned from Maru Special)
A close examination of this photograph reveals that Kaga did indeed
carry a light array on the second tub in the starboard gallery, on
mount S#9. The landing light array can be made out as a thicker line
in the magnified photograph at right. The array can be seen to project
further outboard than the net supports that line the flight deck in
the area. More important, it is clearly mounted in the center of the
gun tub structure, and not immediately abaft it (as was the case with
Akagis aft galleries).
This in itself is strong primary evidence in favor of mount S#9 carrying
a gun tub. It is further reinforced by an illustration recently published
in the Gakken Pacific War Series Volume #13, which illustrates Kagas
starboard side quite clearly (see Figure 20). In this drawing, mount
S#9 is shown having a landing light array attached to it.
Figure 19: Magnification of Kaga's starboard aft 25mm gallery. Mount
numbers are indicated by circled numbers.
Additional evidence includes the probable existence of portholes in
the area in question. The drawings in Jentschuras Warships
of the Imperial Japanese Navy, Hasegawas Nihon no Kokubokan,
ModelArt Volume #3, and Takeshi Yukis painting of her, all seem
to support the existence of portholes in this area of the upper hanger
deck. Three of these drawings show a porthole directly in front of
mount S#8, located in the upper hanger deck, which corresponds nicely
to the wreckage. It should be noted that the illustration in Watts
does not show any portholes, but this work contains drawings that
are in general less detailed than some of the other reference works
An interesting, though inconclusive piece of corroborating detail,
is the hatch shown in the Gakken illustration. Sited midway between
S#8 and S#9 at the back of the gallery, it seems to lead to the upper
hanger deck. The wreckage shows a stairway on the inside of the bulkhead
structure. It is possible that this stairway terminated in a hatch
like the one shown in the Gakken illustration, allowing anti-aircraft
crews to reach their stations from inside the vessel.
Figure 20: Kaga's starboard 25mm gallery. Mount S#9, with landing
light array, is circled. (Scanned from Gakken Pacific War Series,
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