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No. 2. A similar stroke in a graded scale letting the pressure become less and less toward the lower end of the stroke.
No. 3. Reverse No. 2 hardly touching the board at first and increasing the pressure toward the lower end.
If charcoal is used for the lower tones, a very satisfactory scale may be produced as in the last illustration on [Plate 1].
No. 4. Combine No. 2 and No. 3 in a single stroke. Try all these strokes again and again in a vertical, horizontal, oblique, and curving direction until each can be made in a second or two.
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