HC Deb 14 March 1939 vol 345 c195
23. Mr. Pilkington

asked the Secretary for Mines whether he has considered the adequacy of dry lime-stone and sand- stemming plugs as described in the Trans actions of the Institution of Mining Engineers, volume 94, part V, page 424; and whether these are considered generally satisfactory?

Captain Crookshank

The answer to both parts of the question is in the affirmative.