I have posted this youtube video before it shows the Gorilla house mechanism in action.
YouTube - Film Preview: The New Architecture & the London Zoo, 1936
Deja vu! I'm sure we've talked about the round house before, but yes, that video is good. I think this is the first time sand cats in the Roundhouse has been mentioned. I imagine that probably worked pretty well when dimly lit. I think sand cats certainly work best in nocturnal exhibits- the only time i've seen them active is at Bristol in their night house.
Semi-roundhouse related, but nothing to do with aye-ayes, is it true that the koalas at london lived on a diet of Eucalyptus cough-sweets? That's got to be a myth?!
Yes, it was built so that the gorillas could have a larger winter enclosure, but still have a summer enclosure.
Basically, in summer half the house was covered for the public and the other half was open to the elements (much like it is now, with half for aye-aye and the other half for ring-tail lemurs). In winter, the wall would rotate so that the gorillas had the whole exhibit area covered.
Thats not quite true, if you watch the video Kiang has posted, you'll see. In winter the gorillas will have just the indoor half, and the visitors will view from the other half which is now covered. When the summer comes the wall over the visitors area will fold away to give the gorillas an outdoor cage. The wall seperating the indoor/outdoor area was the viewing window during winter, so the public can see right through from the outside during summer.
It is certainly a very innovative, design, I so wish it still worked. It could be suited to housing a very big reptile, that would be okay outside in the sun, but would need to be shut inside during winter.