I think this is the right time to present you my latest steampunk project from the "Dampfkraftlabor" called the:
STEAMPUNKED NIXIE-TUBE CRYPTOGRAPHER
It combines the well known HV-technology of mine by using a flash module of a disposal camera, see: High-voltage-power-supply-for-Nixies, with my most beloved materials brass, copper parts and plywood and vulcanized red fiber and the nixie-tubes! If you take a look to my other instructables e.g the magic-eye-winker you will find a lot of similarities in creating.
Notice: Don´t wreck your health and please obay the following advices:
***Disclaimers***This instructable works with voltages in excess of 250V. This is more than enough to give you a potentially fatal electric shock if handled incorrectly. If you are unfamiliar with how to work with high voltage, please refrain from performing this instructable. Exercise caution throughout the following steps to avoid electrical dangers and also use insulated tools like pliers and screwdrivers and so on.
If you choose to undertake this instructable, you do so at your own risk.
So this is just a funky steampunked gadget for playing or using in RP but it also can be used for simple encoding and decoding messages if your partner build himself the same apparatus. Another modification is to connect both parts with some wires togther so you can "translate" numbers into letters and the other way round......
So have lots of fun with it and with this summer-instructable ;-))))
Cheers Aeon Junophor