Re: When was the observer effect (physics) first observed?

Martin Harran wrote:

It seems to have been first formally stated by Heisenberg in 1958 his
book "The Physicist's Conception of Nature" but I would have thought
that it would have been noted earlier than that.

Unrelated, or only tangentially related (and I didn't even bother, just
Googled the correct spelling of "tangentially"), this whole thing is
100% consistent with the Multiverse... especially when taken in the
context of "The Copenhagen Interpretation."
In *That* case, the Copenhagen Interpretation, the wave function is
misapplied, say, to the photon. It should be applied to the observer.
Simply (or confusingly) put:  The photon exists everywhere it CAN
potentially exist, and then when you observe/measure it you lock YOU
into whatever version of the universe where that photon exists in
THAT particular point in SpaceTime.
I tells ya, it's way hip groovy with bells swinging, this Multiverse
thing.
AND WE KNOW THAT THE MULTIVERSE IS CORRECT, it's the right answer
because it has to be. Though Einstein doesn't name it he certainly
describes it in his Simultaneity... which supposedly has been
scientifically confirmed.
WARNING:  The Multiverse isn't "Different" universes!
There's only one universe and there can only ever be one universe,
as far as we're concerned. If you could step outside our ONE universe
you wouldn't see others. In fact, even THIS ONE UNIVERSE wouldn't
exist!  There would be no space for it to occupy, no moment in time
for it to exist within... there would literally be nothing at all. So
nothing can exist outside of our universe, even if it does.
Absurd? Yes. But that hardly makes it unique...
THERE ARE NO DIVIDING LINES!
Google the whole confusing "Light Cone" nonsense. In a sense, it's
your potentiality. Yours is different from mine. They diverge. So
your reality -- your version of the universe -- can be and at some
level undoubtedly is different from mine. But we can meet and
interact, though I can't think of any reason why I might want to.
So, long story short:  Reality is even more f***ed up than we
normally give it credit for.
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https://jtem.tumblr.com/tagged/The%20Book%20of%20JTEM/page/5