Airmail surveillance and postal airship

These little balloons are an easy way to set up a moving surveillance cam or send emergency postal notices. I frequently get new entries for the archive via those balloons. For demonstration purposes I show the glass clear, but it is usually darkened with sot as to block out the candlelight. The Airmail Balloon is just usable on short distances and you either need one of the complicated automatic mail reciever systems (that take up a whole attic) or very good eyes + the expectation to get airmail to fish the balloon out of the sky. This postal service is safe as long as our foes do not know about it. Maybe it is not very smart to write about it here.....