I have taken these images from two books "Boobytraps" (1965) and "Unconventional Warfare Devices and Techniques - References" (1966). These are two "Army Field Manuals" of the US Army. In these books, soldiers are taught to construct boobytraps out of literally everything available. The key point of these two books is not how to detect these exploding traps but how to construct them.
The basic idea of building a trap out of - let´s say - a tea kettle is to spread terror. If a simple tea kettle might be a bomb that could kill or maim me what is there left to trust. Everything might be a bomb and therefore, in the head of the potential victim,everything IS a trap.