Friday, 1 January 2010

Listening Devices

Check out these pictures of acoustic listening devices which were developed for the Dutch army between WW1 and WW2.

1 comment:

Mr Moo said...

I fancy a pair of these to use at the gym.
" Henry,do you fancy a tasty crumpet?",asked Percival

" Sorry, I didn't quite catch that, I have something large in my ear".