The 1.1" director mount PLATFORM is 6' in diameter with an appromimate 2' diameter base. (Possibly only a 12" diameter. It is said to be a narrow pipe.)
The 1.1" GUN TUB is stated to be on a Square base as in the USS Oklahoma plans.
Based on the Arizona's
1941 Booklet of General Plans, the measurement for the 1.1" Gun Tub is 14' in diameter. The existing belief is for an approximate 8' Square base as in the USS Oklahoma plans and as shown in a photo of USS Maryland.
Here is the USS Oklahoma's plan section, (in white), overlaid alongside the 1.1" mount on USS Arizona 1941 plans:
(For those interested...in "flogging ...")
To clarify, Some may believe the Arizona plans show the support base for the 1.1" gun tub as round.
The USS Arizona plans that I have, do show a round "base" but this is the "mount interface for the 1.1" gun". It is not the base for the gun tub platform. The square base is shown on the USS Oklahoma plans.
Here is a link for the Oklahoma's plan showing dotted lines under a similar Gun tub. It indicates a square base for the gun tub and a round base for the actual gun mount.
http://www.researcheratlarge.com/Ships/BB37/BOGP/RG19AlphaOklahoma157370-3_a.jpg
Tracy White discussed the base of the Gun tub on another forum. He had written that they are "round on Arizona's plans", but was unsure if that was the support underneath the platform or the "mount interface" for the 1.1" guns. ( The circular lines were solid, not dotted)
He reviewed further evidence, (Including a photo of USS Maryland), and posted his current conclusion of a square base. Also, another posting on that same Forum stated the 1.1" gun director platform was mounted on a "pipe" of 9-12" diameter. This conclusion was based a photo of USS Pennsylvania:
Link: http://www.shipmodels.info/mws_forum/viewtopic.php?f=47&t=12942&start=1860
Another member interperted the plans to indicate a 22" diameter pole to support the gun director platform.
Somethung extra...
I did not recall these two Drawings being posted here before.
Arizona "submerged" :
Alt link for image: https://bloximages.chicago2.vip.townnews.com/tucson.com/content/tncms/assets/v3/editorial/8/ac/8acd8a1c-ac2b-11e6-830a-0bc5709966ce/582ca71966c76.image.jpg?resize=1200%2C926
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HooYah Deep Sea
The actual pedestals for the aft 1.1" gun (Directors) are columns 2' in diameter with platforms 6' in diameter, They stand about even with the finished rim of the gun tub.
For a better perspective of this photo...
Nino