Then stab the chisel downwards, as at B, to deepen the end lines.
The end lines are called “goal-lines,” the side “touch-lines.”
Then cut off each end nearly to the end lines of the diagrams, and, with the smoothing plane, finish at perfect right angles.
On the end lines just below the middle line bore a hole with a small gimlet or a hat-pin heated red-hot at Letter A in Fig. 17.