I´ve seen these fitted to German ( SC 50 ) bombs, called Dienartstab in German. What was their purpose ?
I don't really know, but they were probably intended to detonate the bomb above ground, so the explosive force isn't used to dig up dirt.
Do you mean the daisycutters? A bit rod attached to the front of a bomb? Yes, basically designed to make the bomb exploed above ground level, thereby being a more effective Anti-personnel weapon. The idea is still used today.
That sounds similar to the little british invention called the proximity fuse, which was useful for both ground and aerial targets.
