Bolt, a counterweight door, and a pivoted rod with pulley
Fastening devices, with a rule for gauging a moving force by dropping a perpendicular m n onto its line f h
The page collects fastening devices: a bolt drawn in red chalk, a door held shut by a counterweight, and a pivoted rod linked to a pulley and counterweight labelled m f and h n. A note explains how to gauge, at any degree of motion, the strength of the moving power and of the load: from the fixed point of the thing moved, imagine a line that cuts the line of the moving power at a right angle, as m n cuts f h.
On this page
Door closed by a counterweight
One drawing, noted as in pen, shows an uscio (door) held shut by a counterweight. It is paired on the sheet with a bolt (chiavistello) sketched in red chalk.
Pivoted rod linked to a pulley and counterweight (m f, h n)
A pivoted rod is connected to a pulley and a counterweight, its parts labelled m f and h n. The arrangement lets the mover's force be studied against the load it raises.
Gauging the moving power with a perpendicular
To know at each degree of motion the strength of the moving power and likewise of the thing moved, from the fixed point of the moved thing imagine a line that cuts the line of the power at a right angle, as m n does with f h.