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Books Books 61 - 61 of 61 on Every underground plane on which persons travel which is self-acting, or worked by....
" Every underground plane on which persons travel which is self-acting, or worked by an engine, windlass or gin, shall be provided (if exceeding thirty yards in length) with some proper means of signalling between the stopping places and the ends of the... "
Report - Page 33
by Ontario. Dept. of Mines, Ontario. Bureau of Mines - 1892
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Parliamentary Papers, Volume 24

Great Britain. Parliament. House of Commons - Bills, Legislative - 1889
...excecdinc; thirty yards in length) with some proper means of communicating distinct and definite signals between the stopping places and the ends of the plane, and shall he provided in every case, with sufficient man-holes for places of refuge, at intervals of uot more...
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