Arch of beams balanced by counterposed weights
Statics study with hanging loads marked 100, 300 and 300
A red-chalk study, drawn with the page inverted, shows an arch of opposed beams held in equilibrium by weights hung from it. Boxes at the springings are lettered with loads of 300 and 300, and a weight of 100 hangs at the crown or foot of the figure. The sheet is a mechanical analysis of how counterposed weights keep such an arch of beams in balance.
On this page
Arch loaded with weights 100, 300, 300
The figure is labelled with the weights that load the arch: two of 300 at the sides and one of 100 at the centre. The numbers set out the balance of forces that holds the counterposed beams in place.
Arch of counterposed beams
The caption describes an arch of beams set against one another and restrained by weights. The drawing shows the paired beams meeting to form the arch and the loads that keep the structure from spreading.