Great stuff. The bull roarer ruler idea was used by us girls too here in Australia back in the 1950s - before battery operated noise makers. Did anyone else ever send for one of those - throw your voice gadgets and actually make it work? Do you know what I mean? They doubled as bird callers I seem to recall. Little bits of leather you put in your mouth. I was so dissapointed --the ads made them look such fun.
We have a pair of metal poles on our old school property out here in country Victoria, (where the flag poles used to go) and the holes play interesting music when the wind blows from the right direction. Quite eerie on a moonlight night. We are a long way from man made noise and light. We can't wait to try out some of these wonderful entertainments by the light of our ear candles (food grade of course) Our pleasures are simple these days.