from The Century Dictionary.
- noun A keyhole-saw; a thin, narrow saw, fastened in a split handle by two thumb-screws, used for cutting holes in the interior part of work and for sawing curves.
Sorry, no etymologies found.
When the rails are in place the boards may be cut with a pad-saw to curves corresponding with the breadth of the track on the straight.
If a 2-inch bit is not available, mark out a 2-inch ring and bore a number of small holes, which can afterwards be joined by a pad-saw; and finish, the hole thus formed with a half-round rasp.