ten thousand pounds, it would now carry 90 thousand.

V.

ON THE RESISTANCE OF BEAMS.

793.

That angle will offer the greatest resistance which is most acute,
and the most obtuse will be the weakest.

[Footnote: The three smaller sketches accompany the text in the
original, but the larger one is not directly connected with it. It
is to be found on fol. 89a of the same Manuscript and there we read
in a note, written underneath, _coverchio della perdicha del
castello_ (roof of the flagstaff of the castle),--Compare also Pl.
XCIII, No. 1.]

794.

If the beams and the weight _o_ are 100 pounds, how much weight will
be wanted at _ae_ to resist such a weight, that it may not fall
down?

795.

ON THE LENGTH OF BEAMS.

That beam which is more than 20 times as long as its greatest
thickness will be of brief duration and will break in half; and