Many, many years ago (late seventies?), I was working in the Electronics lab at the Research School of Physical Sciences at ANU. A task I was presented was to design and build the electronics to drive the dome at the 48" Schmidt telescope up at Siding Springs, in the Warrumbungle ranges. The electronics simply had to keep the slot in the dome in front of the telescope as it ever-so-slowly followed the distant stars across the sky, and in particular to accelerate and decelerate it gently when moving it, to minimise rumbling the telescope.
And, having built and tested it, then to go up there and install and test it in operation. Our team would be away for a week. Needless to say, I packed a whistle. Never leave home without one....
I had plenty of time to myself, as the job of installing the massive hydraulic system that actually moved the dome far outweighed the time I needed to install my control system. So I spent quite a bit of time walking in the simply gorgeous bush, and finding nice places to play. I couldn't play in or near the staff areas, as stargazers are nocturnal creatures, and need their uninterrupted sleep. But I enjoyed many outdoor experiences, including locations where you could hear the whistle reflecting from the next mountain along....
And while installing the equipment in the dome, I recognised its remarkable acoustics. Its essentially a half-sphere, so stand in the middle and you are at the focal point. Anything leaving there comes back there. Woah....
You can get some idea of the size of the telescope and its dome here. It's daytime, so the telescope is in its rest position, rather than peering through the slot as it will in the night to come. The whistle felt a little puny by comparison. But with those acoustics, really loud!
