Landships II

Thanks Chris (never heard of the Killefer plough before) - looks like those are massive mouldboards set up for a sort of chisel effect (sods turned either side). I guess "shallow" is relative, looks like it is meant to go far deeper than any simple mouldboard plough. Would take a lot of grunt to shift that plough at full penetration (3 feet maybe?). I wonder if the share-mouldboard assembly is hinged so as to skip over major underground obstacles? Can't quite make it out but should imagine some sort of provision would need to be made.