Abstract: The invention relates to a system for providing a protective coating to a body such as a tubular structure. An annular formwork is erected encircling the structure leaving an annular gap between the formwork and the structure. Resin is injected into the annular space. The formwork may comprise two hemi-cylindrical parts which are clamped together by clamp means.

Abstract: The invention relates to a cover for shielding an article from incident heat energy and includes a first, non-heat reflective, sheet of material, a second sheet of material adapted to reflect heat, and a layer of non-abrasive sheet material. The sheets are superimposed and secured together to comprise a laminate, with the covering being tailored to provide a desired configuration. The covers are flexible thermal insulation covers tailored to fit and cover a particular shape of article which requires thermal insulation. The cover has spaced round its perimeter pockets or flaps into which are secured extensible members having a free end adapted to be hooked round a part of the article to maintain the cover securely in position.

Abstract: The invention relates to a constructional element such as a tunnel lining, part of which is shown in the drawing, comprising adjacent segments which have facing surfaces between which there is a joint which is physically deformable under load. The joint comprises a toroidal body or tube of substantially circular cross section received in complementary or semi-circular facing recesses in the surfaces respectively, and comprises a flexible material such as polypropylene and which means in the form of a nozzle for gaining access to the interior of the body. The body is initially filled with a fluid, which could be a liquid or gas, through the nozzle, which can then be maintained in the body by closing the nozzle as by a valve.

Abstract: A reflector (3) may be mounted in a hollow housing (2) adapted to fly in ambient air. The reflector device (3) may be formed from a coating on the surfaces of blocks, the coating being metal or dielectric. Reflecting surfaces whether self supporting or not may be formed as intersecting circles or polygonal (more than four sides). They may be suspended in housing (2) adapted to fly either directly or indirectly by means of an intermediate body within the housing.

Abstract: The invention relates to an absorber of incident electromagnetic radiation in the microwave band, comprising a metal reflector supporting seriatim a sheet of plastic material permeable to electromagnetic energy, an electrically conductive sheet in the form of a plastic layer on which is deposited an electrical conductor, and a further sheet of material permeable to electromagnetic radiation.

Abstract: The invention relates to a protective cover which is complementary in shape to and is mounted on a sensing head such as that of a missile.The protective device performs a dual function in that it is resistant to abrasion by impacting material such as dust, sand or ice, while at the same time being transparent to incident electromagnetic radiation which the sensing head is adapted to sense. The protective device may be moulded from a thin sheet (0.2 mm thick) of polytetra-fluoroethylene when this radiation is infrared.

Abstract: A toilet roll dispenser, comprising a holder for a toilet roll, a medicament reservoir, and means operable selectively to apply medicament to a part of a surface of a toilet roll as it is dispensed.