Second Method: The only difference between the second method and the first method consists in the fact that the first broad surface, instead of simply having its face mark put on, must be planed smooth and free of mill marks. There is but one test for this surface, a test with the trysquare held as in Fig. 56 to see whether the board is straight across the grain, the test being made at a number of places along the board.
Fig. 56. First Test for Surface Trueness.