Richard
Cricket Web Staff Member
Remind me then - how do the things work? It is really impossible to develop them so that there is only a small area in the sensitive spot? The human stride is a big enough thing, even for those with small delivery-strides - and obviously the "sound" would be sounded for a no-ball, not a legitimate delivery. Ergo, you simply need a small area which the foot has to land in (and if the bowler's bowling from miles behind that, a rare enough instance, you just switch it off - and you don't need to look closely to see whether a bowler is moving from miles behind the popping-crease to somewhere near it) and if it doesn't, the noise sounds in the Umpire's ear and no-ball is called.