Abstract: A modular partition system comprising a pair of panels (12) united by a hinge. Each panel (12) includes a frame (18) constituted by rectilear frame members (18a-d) united in a non-collinear relationship. The frame members (18a-d) are releasably connected at mating ends by a set of fastener-free tongue and groove joints. The frame members (18a-d) have longitudinally extending channels (28) providing the frame with a continuous inwardly facing groove for receiving the peripheral edges of a flat panel member (20).

Abstract: The invention relates to a vessel which comprises a floating body upon which a seat for a person is mounted. The vessel is driven by human power through a treadle mechanism which drives a propeller.The treadle mechanism comprises two actuating elements which are each pivotable and are driveable by arms or legs and which are coupled by a driving shaft through a freewheel clutch. By avoiding the death centers which are present in a cycle treadle mechanism, human power is used efficiently.By making the floating body a gliding body the water resistance is reduced, so that together with the efficient propulsion mechanism a high travelling speed through the water is reachable.