Abstract: Refuse derived fuel is produced by taking raw refuse, pulverizing it and n screening it to remove fines and oversize material, the screened residue being passed to an air classifier where the light fraction, rich in paper and plastics, is separated. This light combustible refuse fraction is then passed to a densifying machine, either directly or via a secondary shredder, to produce partially compacted material which is then dried in a rotary dryer. The dried material can be passed to a second densifying machine which produces pellets in the form of small dense cylinders or blocks having a calorific value equal to about half that of coal. Coal dust or other combustible particulate material can be added to and mixed with the combustible fraction between the two densifying machines.

Abstract: A buried expansion joint for use in the construction of bridges incorporates a pad of flexible plastics material, such as neoprene, located over an expansion gap between structural members and a flashing of neoprene or other plastics material extending over the pad and stuck to the structural members by adhesive bedding. The pad may have channels or voids extending along its transverse dimension adjacent its edges which in conjunction with aligned grooves in its upper and lower surface provide a corrugated web section allowing compression longitudinally of the structural members without any substantial increase in vertical compressibility.

Abstract: In a vehicle, an insulated multi-turn vehicle loop arranged to form a traormer with any roadway loop when said loops are in proximity; means for tuning the vehicle loop to form a vehicle loop circuit resonant at a first frequency; and means for modulating the vehicle loop circuit at a second frequency; whereby, in use, a signal modulated at said second frequency can be induced from the vehicle loop into any said roadway loop for the identification of said vehicle; and vehicle identification means comprising a roadway loop upon or in the surface of a roadway; means for tuning the roadway loop; means for energizing the roadway loop at a first frequency at least near to the resonant frequency of the tuned roadway loop; and a vehicle identification circuit having demodulation means and frequency detection means arranged to detect in the roadway loop any signal at the first frequency modulated at a second frequency, said second frequency being produced for the identification thereof by a vehicle as aforesaid and t