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Irreversibility temperatures T,(H) were magnetically measured for the aligned powders of superconducting oxides, La1.85Sr0.15Cu04, YBa2Cu307, Bi2Sr~CaCu208, and Bi2Sr2Ca2Cu3010, and for the metallic superconductors, Nb, Nbof the thermally activated flux creep and the lattice or the glass melting models for the irreversibility temperatures. Also, the measurement procedures for TI@) using a SQUID magnetometer are described in detail, since the measuring methods and the criteria which are used for T,(H) are important in the determination and interpretation of the temperatures. Ti, Nb:Sn 2End PbMo&. the res.!ts xe beefly disc.ssed in te?Es ,,,c.aS"Iz*I v y L1113 ,GbrrrL,yur.

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