# The Coal Mines (Precautions against Inflammable Dust) Order 1956, Paragraph 9


When any sample of dust is to be analysed for the purposes of these regulations it shall be well mixed and a representative portion which is passed through a 60-mesh sieve of a specification approved by the Minister shall be analysed by a method so approved.

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Source: https://www.legislation.gov.uk/uksi/1956/1769/schedule/paragraph/9 (the official version)
Page: https://openlegislation.uk/coal-mines-precautions-against-inflammable-dust-order-1956/schedule/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.