Abstract: A corrugated sheet for use as part of a composite concrete deck comprising parallel spaced crest surfaces connected to parallel spaced soffit surfaces by upstanding connecting web surfaces that converge towards each other as they approach a common crest surface, all the crest, soffit and web surfaces being generally planar with at least the crest surfaces furthermore being provided with upstanding, continuous, longitudinally extending beads made from the crest surface material and with laterally extending upstanding projections running between the beads and connecting them together. The panels between the beads and the projections function as shear panels. An alternate embodiment provides shear panels that are slightly depressed with respect to the surrounding surface material, projections that have flat upper surfaces, and a panel edge portion that is shaped to enable the panels to be secured together in overlapping relationship.

Abstract: A control arrangement for plate cutting apparatus capable of making a cut which curves in, and is angled with respect to, the local plane of a plate, which arrangement comprises a programme representation defining a curve and relating an angle to that curve, and first and second sensor devices arranged to be responsive respectively to representations of the curve and corresponding angle, and arranged to send signals capable of controlling relative movement between the plate and a cutting device, and angular movement between the line of cut and the local plane of the plate respectively, in accordance with this programme.