(ZA9208571-A)      The solar energy collector includes a platform (13) supported for rotation about a vertical axis and pivoted about this axis via a drive, to track the movement of the sun across the sky. The platform has concentrators for directing the incident solar radiation onto solar collectors, provided by a number of parallel, elongate, parabolic reflectors, each concentrating the solar radiation along a horizontal focal line, along which the collector is positioned.    Pref. the platform floats on the surface of a fluid in a fluid reservoir (12), and the platform is selectively submerged to protect the concentrators from bad weather.    ADVANTAGE -   Solar collector designed for simple inexpensive construction, with protection against bad weather.    .D    (US5309893-A)      The radiant energy collector includes a fluid reservoir, a platform floating on the fluid reservoir, a drive structure for moving the platform on the reservoir, radiant energy collectors supported on the platform, reflectors for concentrating radiant energy on the radiant energy collectors, and a device for selectively submerging the reflectors beneath fluid from the reservoir for protection against inclement weather conditions. Fluid feed impellers are supported beneath the platform within the reservoir and communicate with ports through the platform for pumping fluid onto the platform and reflectors.    Opposing fluid impellers are associated with each fluid feed impeller, the opposing impellers being operable with the feed impellers to force fluid in an opposing direction to the feed impellers, with deflectors being disposed between the feed impellers and the opposing impellers. A duct is associated with at least one impeller and is configured so as to direct fluid adjacent the at least one impeller in a vertical direction and direct fluid through its other end at least partially in a horizontal direction.    ADVANTAGE -   Flotation devices secured to platform support platform when reflectors are submerged beneath fluid from reservoir, buoyancy of flotation devices per unit height increasing from bottom to top of flotation devices. Alternatively or in addition, low pressure is established beneath platform to restrain platform against buoyant force on platform.    (JP7500901-W)      The solar energy collector includes a platform (13) supported for rotation about a vertical axis and pivoted about this axis via a drive, to track the movement of the sun across the sky. The platform has concentrators for directing the incident solar radiation onto solar collectors, provided by a number of parallel, elongate, parabolic reflectors, each concentrating the solar radiation along a horizontal focal line, along which the collector is positioned.    Pref. the platform floats on the surface of a fluid in a fluid reservoir (12), and the platform is selectively submerged to protect the concentrators from bad weather.    ADVANTAGE -   Solar collector designed for simple inexpensive construction, with protection against bad weather.    (RU2109227-C1)      The solar energy collector includes a platform (13) supported for rotation about a vertical axis and pivoted about this axis via a drive, to track the movement of the sun across the sky. The platform has concentrators for directing the incident solar radiation onto solar collectors, provided by a number of parallel, elongate, parabolic reflectors, each concentrating the solar radiation along a horizontal focal line, along which the collector is positioned.    Pref. the platform floats on the surface of a fluid in a fluid reservoir (12), and the platform is selectively submerged to protect the concentrators from bad weather.    ADVANTAGE -   Solar collector designed for simple inexpensive construction, with protection against bad weather.    (JP3131220-B2)      The solar energy collector includes a platform (13) supported for rotation about a vertical axis and pivoted about this axis via a drive, to track the movement of the sun across the sky. The platform has concentrators for directing the incident solar radiation onto solar collectors, provided by a number of parallel, elongate, parabolic reflectors, each concentrating the solar radiation along a horizontal focal line, along which the collector is positioned.    Pref. the platform floats on the surface of a fluid in a fluid reservoir (12), and the platform is selectively submerged to protect the concentrators from bad weather.    ADVANTAGE -   Solar collector designed for simple inexpensive construction, with protection against bad weather.