Abstract: A floor construction, suitably for use in rooms containing electrical switchgear, computers and like apparatus, comprises a plurality of mutually parallel, elongated and longitudinally extending first joists (8,9), and a plurality of mutually parallel, elongated, transversely extending second joists (12,13,14,15) extending at right angles across the first joists (8,9). The joists define one or more square and/or rectangular cavities, which are covered by one or more right-angled slabs (7,7',7"). These slabs form the surface of the floor and are dimensioned so as to be supported along the whole of their edge portions by the upper surfaces of adjacent joist sections.The elongated, longitudinally extending first joists (8,9) are provided with a plurality of first recesses (20) spaced at a given distance apart. These first joists (8), of reduced flexural resistance, are arranged to lie on a supporting foundation.

Abstract: A tool for sailing with skates, skis, roller-skates, skate-board or corresponding gears. The invention consists of a carrier bar (1), fastening points (24,25) movable in the longitudinal direction of the carrier bar for connection at the sailor's feet or a corresponding point, centering means (16,18,22) for controlling the position of the fastening points along the carrier bar so that the center of the latter is always substantially half-way between the fastening points, and a holder (10) articulately mounted at the center of the carrier bar for fastening a sail carrying mast (13).