In fact, she may have been a bottom knocker.jimbob23 said:Were my nan still around I'd be able to ask her, as she was, I think (I may be wrong), a sagger maker in one of the potteries. Whether she had a bottom knocker or not, I'm not sure.
http://en.wikipedia.org/wiki/Oatcake#North_Staffordshire_oatcake
God, I'm hungry.