Nodal geodetic building structure - has set of tubes each fitting in slots milled in ends of adjacent ones

摘要

The nodal geodetic structure comprises a set of 4, 5 or 6 tubes, whose ends are specially machined so as to fit closely together, slots being milled in them of the same dia. as the external tube dia. together with two holes at right angles to the tube axis near the ends, one passing both through the tube axis and that of the slot, while the other is at right angles to the first. The design allows no length alteration of lateral or upwards deflection, and also absorbs torque.