You mean you made them and they didn’t turn out? Do tell… what happened?
Well, it’s been years, so I don’t remember exactly, but whenever I come across that page in the BBA, I shudder and turn the page quickly. I suspect that the main problem was that I didn’t roll out the dough thin enough and the “crackers” puffed out and were still a bit doughy inside when they were thoroughly browned. They tasted awful. But I’m sure it was entirely my fault, so I wouldn’t discourage anyone from attempting the recipe. I had never made a cracker before, so I had no experience to draw from.
BTW, there are several cracker recipes in King Arthur’s Bakers’ Companion.