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Naeve Cross solar concentrator

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Unfortunately, the Naeve Cross does have disadvantages. Compared with a paraboloid, more mirror material is needed. Also, since, the light is reflected twice, more of it is lost. The device does not share one of the main advantages of simple trough cookers, their tolerance of movements of the sun parallel to the length of the trough. This can allow a trough cooker to work for hours every day without any need for tracking the sun. But movement of the sun parallel to the length of one trough of a Naeve Cross is perpendicular to the length of the other, so the Naeve Cross has to be moved continuously or frequently to track the sun, like a paraboloid.
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Unfortunately, the Naeve Cross does have disadvanteges. Compared with a paraboloid, more mirror material is needed. Also, since, the light is reflected twice, more of it is lost. The device does not share one of the main advantages of simple trough cookers, their tolerance of movements of the sun parallel to the length of the trough. This can allow a trough cooker to work for hours every day without any need for tracking the sun. But movement of the sun parallel to the length of one trough of a Naeve Cross is perpendicular to the length of the other, so the Naeve Cross has to be moved continuously or frequently to track the sun, like a paraboloid.
   
 
Nevertheless, Naeve's device is potentially very useful. [http://kmr.nada.kth.se/wiki/Main/PointFocus Here] is his story of the discovery and how he tried to spread the knowledge.
 
Nevertheless, Naeve's device is potentially very useful. [http://kmr.nada.kth.se/wiki/Main/PointFocus Here] is his story of the discovery and how he tried to spread the knowledge.
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