Casgliadau Arlein

Full Title - 'Electric Bells and Relays for Bare Wire Signalling.' M.D. Circular No.24. Three copies of the same document (with a paperclip holding them together). One page Mines Department Circular, on off-white paper, with black printed text. Loose inside a black leather hardback cover (with other coal mining regulations, bills etc) with the 'British Thomson-Houston Company / Electrical Engineering Manufacturers / Rugby' printed on it, and a sticker with 'Coal Mines Regulations' stuck on the front cover.