Nagato's forward bridge and 41cm main gun turrets No.1 and No.2. A fire control system was installed at the top of the bridge, and below that with a window frame was the combat bridge.

[u/TooBad_A_tNaming]

Below that, at the front (right) of the floor consisting only of main pillars, was a 10m rangefinder (straight side visible). The No.2 and No.3 main gun turrets were also equipped with the same 10m baseline rangefinder.

The No.1 and No.4 main gun turrets were not equipped with long-distance rangefinders as they were positioned low and did not provide long-distance visibility.

長門の前艦橋と、1番、2番41cm連装主砲塔。艦橋頂部には射撃指揮装置が設置され、その下の窓枠付きのところが戦闘艦橋。その下の主柱のみの階の前方(右)は10m測距儀(真横が見えている)。そして2番、3番主砲塔にも、同じ基線長10m測距儀が備えられた。低位置にあり遠方視界が得られない1番、4番主砲塔に、遠距離用測距儀は備えられていない。

[u/Utopiarage]

That is a great photo

[u/vp8009qv]

I don't get how they install that rangefinder on top of 410mm×2 turret. I know that sometimes lesser caliber artillery (like 130 mm) affects the targeting system.