Tay Bridge disaster
"Wind-pressure alone (supposing the structure to have been perfectly made, and so designed) to the amount of 37 lbs to the square foot would have overthrown it, but that, being perfect, it fell in consequence of an excess of wind-pressure is evidently not the case, [because] it did not fall upon those points which would have been the least lines of resistance had the structure been perfect. The mode in which it fell shows that there must have been weak points in the structure and that, with the knowledge which I have [of parts which already had to be repaired], ... shows me that the structure was not in that perfect condition".