I would love to install some voicepipes aka speaking tubes for fun.
I know they were used on ships, maybe still are.
I'd even put one at the front door and run it to my desk. Out to the coop instead of using the baby monitor? That would save a small amount of electricity and every little bit helps.
Here's some historical info about them, with pics:
http://www.dself.dsl.pipex.com/MUSEUM/COMMS/voicepipe/voicepipe.htm
I know they were used on ships, maybe still are.
I'd even put one at the front door and run it to my desk. Out to the coop instead of using the baby monitor? That would save a small amount of electricity and every little bit helps.
Here's some historical info about them, with pics:
http://www.dself.dsl.pipex.com/MUSEUM/COMMS/voicepipe/voicepipe.htm