Revision history of "File:Ch2 Fig18.jpg"

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  • curprev 19:52, 28 February 2009‎ Oferiks talk contribs‎ 192 bytes +192‎ 2-2-215 N DIRECTIONAL DRUM LENS illustrating the principle of a CONVERGED BEAM 2-2-215 ( in the absence of the converging prisms a 360° fan beam of nearly uniform intensity would be produced)
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