Mining: A Journal Devoted to the Interests of Mines and Mining Students, Τόμος 2

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Σελίδα 135 - An adequate amount of ventilation shall be constantly produced in every mine to dilute and render harmless noxious gases to such an extent that the working places of the shafts, levels, stables, and workings of the mine, and the travelling roads to and from those working places shall be in a fit state for working and passing therein.
Σελίδα 213 - The roof and sides of every travelling road and working place shall be made secure, and a person shall not, unless appointed for the purpose of exploring or repairing, travel or work in any such travelling road or working place which is not so made secure.
Σελίδα 159 - ... be provided with guides and some proper means of communicating distinct and definite signals from the bottom of the shaft and from every entrance for the time being in work between the surface and the bottom of the shaft...
Σελίδα 232 - In the case of places in which watering would injure the roof or floor, unless the explosive is so used with water or other contrivance as to prevent it from inflaming gas or dust, or is of such a nature that it cannot inflame gas...
Σελίδα 26 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Σελίδα 37 - Triangles upon equal bases, and between the same parallels, are equal to one another.
Σελίδα 232 - Act, or which is dry and dusty, no shot shall be fired except by or under the direction of a competent person appointed by the owner, agent or manager of the mine...
Σελίδα 138 - Act, to be used, a competent person who shall be appointed for the purpose shall examine every safety lamp immediately before it is taken into the workings for use, and ascertain it to be...
Σελίδα 99 - To find the area of a trapezoid. RULE. Multiply half the sum of the two parallel sides "by the perpendicular distance between them : the product will be the area.
Σελίδα 232 - Unless the place of firing, and all contiguous accessible places within a radius of 20 yards therefrom, are at the time of firing in a wet state from thorough watering or other treatment equivalent to watering, in all parts where dust is lodged, whether roof, floor, or sides ; or (2.) In the...

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