Examine the Inner Workings of a Home Security System

It was back in the early seventies that home security systems began to appear in homes and even back then they were basically trip mechanisms that were installed on windows and doors. This meant that someone had to actually break into a home before the alarm would sound. Also, back then there were no automated security monitoring services such as ADT, so all there was, was an alarm that could be thwarted if someone possessed the know how.