A pallet for the stable transport of goods; the pallet comprising at least one surface element, and a plurality of side elements arranged, in use, to maintain the at least one surface element under compression. The mobile node has a home address in a home network is temporarily connected at a care-of address in a foreign network. Excess liquid is removed from the evaporator chamber by a return stroke of the dosing device. In operation, the air lance directs a flow of air against the surface of the slurry. Most preferably, the optical waveguide is generally structured as an anti-resonant reflecting optical waveguide, which comprises a Fabry-Perot reflector adjacent to the core layer, whereby light is substantially prevented from leaking out of said core in a transverse direction.