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the plank and the man will never go up again but must remain in his
place till the man at the other end dashes up the board.
[
Footnote: See Pl. XXIV, No. 3.]
3
87.
Of delivering a blow to the right or left.
[Footnote: Four sketches on Pl. XXIV, No. 1 belong to this passage.
The rest of the sketches and notes on that page are of a
miscellaneous nature.]
3
88.
Why an impetus is not spent at once [but diminishes] gradually in
some one direction? [Footnote 1: The paper has been damaged at the
end of line 1.] The impetus acquired in the line a b c d is spent
in the line d e but not so completely but that some of its force
remains in it and to this force is added the momentum in the line d
e with the force of the motive power, and it must follow than the
impetus multiplied by the blow is greater that the simple impetus
produced by the momentum d e.
[
Footnote 8: The sketch No. 2 on Pl. XXIV stands, in the original,
between lines 7 and 8. Compare also the sketches on Pl. LIV.] A man
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