OK, been meaning to do this for a while.
One of the things that was reported early on with the Essex class was that night time operations in the hangar were highly disrupted by the need to darken the hangar whenever a door was opened. One of the solutions was the creation of what were initially called "Light Labrynths" around doorways to the outside. I've also seen them referred to as Light lockers. These were light sheet-metal covers over the inclined ladders leading up to doorways from the main (aka hangar) deck. The documentation I have on them indicates they were to be manufactured by the ship's force so they could have appeared at any time (as opposed to upon a major overhaul). If you want you can read the original I OCR'd and posted
here.
CV-16 Lexington and CV-17 Bunker Hill got them first as they were test ships for the concept. All of the other ships should have got them starting July 1943 or so.
I have some pictures of them,
here's one of CV-13 Franklin's damaged after the Kamikaze attack of October, 1944 (this was the one just aft of the #2 elevator that lead up to where the ship's launch was kept.
This is the top of one further aft on the port side as well as a
slightly different shot.
This would be farther back on the port side.
There were very few open platforms on the inside bulkheads of these ships as compared to, say, the Yorktown class. There were some, and a lot in the overheads, but not to the doors out to the decks.
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Tracy White -
Researcher@Large"Let the evidence guide the research. Do not have a preconceived agenda which will only distort the result."
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Barbara Tuchman