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the head, and so straightens the spine which was curved.
[32] The higher the step is which a man has to mount, the farther
forward will he place his head in advance of his upper foot, so as
to weigh more on a than on b; this man will not be on the step
m. As is shown by the line g f.
[
Footnote: See Pl. XXIII, No. 1. The lower sketch to the left
belongs to the four first lines.]
3
76.
I ask the weight [pressure] of this man at every degree of motion on
these steps, what weight he gives to b and to c.
[Footnote 8: These lines are, in the original, written in ink]
Observe the perpendicular line below the centre of gravity of the
man.
[
Footnote: See Pl. XXIII, No. 2.]
3
77.
In going up stairs if you place your hands on your knees all the
labour taken by the arms is removed from the sinews at the back of
the knees.
275
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