Re: Again I have to ask...
Back in the days of Kerosene TVs (Kerosene = Paraffin) telephones had wires going to a central office. The was a device, reed switch, which would allow a interested party to turn the phone into a room bug at the will of the bugger (!). It did this by having a mechanical switch that would bypass the ringer and make the phone go off hook while sitting in the cradle. If this was done with 1930s tech, think of today's possibilities. For ten dollars and a bottle of my favorite Russian Imperial Stout the challenge is to build an Alexa in the steam punk manner and see what relic parts could do at what cost. Then go watch Black Hats U-tubes to see how cheap surveillance now.