If one end is sharply pressed in, a compression can be seen running along the spring.
Thus a push or a compression of the X air is transmitted onwards in the direction OX.
The compression members are of timber, except the struts and bottom chord panels next the river piers, which are of steel.
o tons in verticals and long compression members.
The opposite axes are connected with springs which are kept in compression by tension of the rope in drawing but come into action when the pull is released, the side axes then biting into wooden guides or gripping those of steel bars or ropes.