SHOT-FIRING IN COAL-MINES.
With regard to the invention attributed to Mr Miles Settle, in our article last month on ‘Shot-firing in Coal-mines,’ we are informed that Mr James Macnab, 39 Mortimer Street, Cavendish Square, London, claims to have had the priority with a patent for the same or a similar object. We cannot enter into the technicalities of the question, but think it right at the same time to make this announcement.