Abstract
The M1 and M2 edges of lead, not having been previously measured, were investigated. They were found to occur at wave-lengths: M1, 3.219 A; M2, 3.469 A. A brief discussion of M edges is given and the fact that many M edges show discrepancies between observed and calculated values is noted. Methods of computing edge energies are discussed. The proposed explanation and meaning of these discrepancies are discussed with particular reference to lead.

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