The Grand Debate(8)
[Construct Analysis Module-1: Allows the host to analyze and derive schematics of constructs both magical and mechanical.]
The round metal bands that had been around the necks of the children had been mechanical constructs that were designed in such a way that the trigger would be activated if they were detached without using the key.
It was an almost foolproof system, as one couldn't even figure out the location where the key had to be inserted due to the sheer complexity of the design.
Daneel had been quite surprised to see something like this in Angaria. So far, he had always thought that due to the prevalence of magic, research was mostly focused on making objects which used magic in one way or another to achieve miscellaneous things.
This collar was completely made using mechanical skill except for the alert system. According to the system, it used an ingenious mechanism similar to the one used in handcuffs back on earth.