This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
Besides the ordinary planes, the cabinet-maker uses a "toothing" plane. This has a stock similar to the hard wood hand-plane, but the iron, instead of having a cutting edge, presents a series of sharp teeth to the wood. This serrated edge is formed by long narrow grooves on the face of the iron nest the wedge, and when the iron is ground in the usual manner these ridges terminate in sharp points. In setting-up this iron on the oil-stone, only the ground back is applied to the stone. The position of the iron in the stock is nearly perpendicular, so that it is simply a scratch plane, and needs no cover like the others. Its use is to roughen the surfaces of pieces to be glued together, for while it takes off the ridges left by the half-long or panel plane, it roughens the surface by scratching, thereby adapting it better to hold the glue. All surfaces to be veneered upon, as well as the veneer itself, are scratched with this plane.