Shutter speeds of 1/25, 1/10 and 1/5 were used. I am not sure of the exact speed of each of these photos. A steady hand is required when shooting at these speeds with no tripod.
Well, I personally strongly favour the first one - I'm one for any diagonal lines in photos, and I find those both in the ceiling lights as well as the windows, so I just love this one.
"No flash allowed" is a challenge, and one that I sometimes try to take, too, with varying results (often my waste paper basket gets a lot "to eat" then), but those that turn out make me squeal with delight.
So I do appreciate that you took that challenge with the wonderful old equipment you're using, P (does that stand for Peter, maybe?), and must say that you succeeded very well.
Indoor photography with no flash is a challenge, but the results are great if you can get it right. I got quite a few nice shots at the museum. I will post more later. You guessed the name correctly.