§ 3. Mr. E. J. WILLIAMS (for Mr. D. L. DAVIES)asked the Secretary for Mines the date upon which flame safety lamps fitted with double gauzes containing 20 apertures per square inch was first approved by the Mines Department, indicating the nature of the tests to which such lamps were submitted before receiving approval?
§ Captain CROOKSHANKThe decision to authorise the use of gauzes with 20 meshes to the linear inch in double gauze safety lamps was made public on 9th February, 1925. It was based on the results of research and tests, reports of which had been published previously. I will send the hon. Member copies of the reports.