Abstract :
G. B. Rosenblatt: The paper apparently deals mostly with the application of certain electrical equipment to coal mining and makes little reference to metal-mining practise with which I am much more familiar. If it will be remembered that the remarks I have to offer are based on my experience in the metal-mining field and may fit in with coal-mining practise only insofar as they may apply to it, I would like to offer the following comments:
