Paragraph 4
It shall be the duty of the manager of every mine to ensure that every bulb used in an electric safety-lamp of a type for the time being approved by the Minister for general use by workmen is a bulb—
(a)
of a type approved by the Minister and marked in a manner specified by the Minister in or in relation to that approval;
(b)
where the safety-lamp is of a type the approval for which contains provisions relating to the characteristics of any bulb to be used therein, in conformity with those provisions.