Paragraph 12
Determinations of the firedamp content shall be made—
(a)
by means of apparatus of a type approved for the purpose by the Minister, by a competent person appointed for that purpose by the manager of the mine; or
(b)
by means of samples of air taken by a competent person so appointed and analysed within four days. (without taking into account any Saturday, Sunday or day of general holiday) of the taking thereof.