These same girls were also very well versed in the technology of induced magnetic fields so had no trouble in secreting a very powerful electric field generator in their respective knickers.
As it turned out the system was so efficient that even an apparently severe 12 stroke tawsing with the Lochgelly was considered a Sunday School picnic.
I myself was never naughty enough to be invited to bend over and have my skirt raised, however I can say without any equivocation the technology certainly was responsible for taking quite a few very vulnerable bottoms off the endangered species register.