Note Footnote 5 — EXPERIMENTS ON RETAINING WALLS AND PRESSURES ON TUNNELS.
Reading edition
: We can suppose, here, the horizontal force to be the pull of a cord extending horizontally from the box and passing over a fixed pulley, and that at the free end of the cord a weight is applied. The friction of the pulley and carriage wheels could be found experimentally and allowed for, so that some fraction of this weight would equal .] Return to text