I could be misremembering, but I believe this is a bit of photography trickery. I think there is actually a platform under his feet and it’s not as far down as it seems.
Yep, bloke’s not even vaguely straining to hang off anything.
idk about this but after seeing the trickery with the mirror I can believe anything.
I found an article on other photos taken during that time. It doesn’t mention this one specifically but it does say there were a whole series of photos staged on beams during construction of the RCA building. It was a promotional photo shoot.
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Meanwhile the photographer: casually hangs on the second thingy but with only one hand (the other one is occupied by the camera)