This section is from the book "Mrs. Rorer's Vegetable Cookery And Meat Substitutes", by Sarah Tyson Rorer. Also available from Amazon: Mrs. Rorer's Vegetable Cookery And Meat Substitutes.......
1/4 pound Scotch or Irish oatmeal
1 tablespoonful butter
1/2 teaspoonful salt
1/4 teaspoonful bicarbonate soda
Put the meal in a bowl. Put the butter and the soda in a cup; fill the cup half full of boiling water, and when the soda is dissolved and the butter melted, pour them quickly into the meal. Add the salt. Take the mixture on a board and knead it until it holds together. Dust the board with dry meal, roll out the oat-cakes into a thin sheet and cut with a sharp knife into cakes two inches square. Lift them on a cake turner, put them in a greased pan and bake in a moderate oven until thoroughly baked and slightly browned.
Whole wheat nut wafers may be made in the same manner.