@betajet: Batman: I like to think it's because... our hearts are pure.
LOL It was so sappy -- I loved it as a kid. I remember whenever the Riddler created a riddle and they solved it and the solutuion was so wild and wacky ("... and what eats an unripe banana at three o'clock in the afternoon Robin...") but it all seemed to make perfect sense when you were a kid... you just thought they were really clever to sort out the clues :-)
Lots of security agencies used wire recorders during spy activities. There was a brand in Austria creating extremely small types of wire recorders, called 'Miniphone'. Have a look at our website http://www.cryptomuseum.com/covert/minifon/mi51/index.htm to see one of those Miniphone recorders and also note the wrist-watch where a microphone is hidden inside. There was once a spy captured on an airport. Because he wore 2 watches, since this watch was not able to run on time (no watch mechanics inside this silly thing ;-)
Other examples are wire recorders to record in flight information. The Russians had a beautiful designed tiny wire recorder in their MIG airplanes. One advantage is that wire can withold high temperatures. the 'pack of wires' isolate those inside the 'pack', hence, big chance of signals recovery once a plane has been crashed...
Anyway, lots of excamples to be found and big fun to play with.
In the summer of 1953 I received a one month appointment as an Engineering Aid (GS-4, $3175.00 per annum) at one of the three Signal Corps Engineering Labs at Fort Monmouth, NJ following Signal Corps ROTC Summer Camp at Camp Gordon GA. My assignment was to run tests on a prototype wire recorder for field use built by General Electric. The wire was very springy like piano wire and had a tendancy to pop off the spools. If you had the missfortune to drop a spool, it took an hour or more to untangle and rewind the wire, not something that could be done in the field. The other problem I recall had to do with the variation in read signal as the wire twisted and the read head saw the side of the wire the record head had seen and then the other side.
A tape recorder was being evaluate at the same time and was vastly superior. In fact the wire recorder had already been rejected. In retrospect that may be reason I was given this task. Nevertheless it was a good experiance.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.