(under the class definition) Machine for cutting a groove in lumber at substantially right angles to the grain.
(1) Note. Gaining is, broadly, the cutting of a notch in a board to receive another part. However, more specifically, it is a technique for using lumber of irregular thickness by notching it more deeply at the thicker joints with connecting members. For example, a machine for notching the bottoms of irregular thickness flooring joists where they rest on the sill so that the tops of all joists are level with each other is included herein.
(2) Note. Gaining, of this subclass, is usually by means of a rotary cutter.
