Remote Control
Some effects can be operated locally (shelves and pictures can be dropped by removing nails or supports from behind). Others have to be controlled from a distance.
Electric ignition
A novel method of releasing something can be achieved by using one or more pyrofuses (page 112) and a nylon drop line.
The item to be released is tied to the nylon line, which passes through a transverse hole in a short length of metal tube. This tube has a diameter sufficient to accommodate a pyrofuse, which is positioned with its head against the line. A small plug of paper is inserted to trap the spark and retain the heat.
Firing the pyrofuse causes the nylon to melt and release the load. A priming of gunpowder is needed for heavy lines.
Solenoids ...
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