After indicating the basis of the fired materials and primarily with one particular technique, its use with a cryogenic SQUID technique, the Thellier technique, by which the magnetometer is outlined, particular emphasis ancient intensity may be determined. Intensity being given to the need for stringent reliability determination is only one part of archaeocriteria.Comparison of results for some samples magnetism, determination of ancient direction is made with results obtained using the Shaw being more widespread because measurement is alternating-field technique, and the agreement is faster and reliable results are easier to satisfactory.Determinations made on 14 samples fired during the last 150 years give results which on average are in close agreement (within 2%) with observatory-based values, the standard deviation of a sample from the predicted value being ñ6%. o o o J J ß • 0 J v v ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß ß

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