Miners' Circular, Utgaver 53-61

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U.S. Government Printing Office, 1945

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Side 85 - ... when tested at a point not less than 12 inches from the roof, face, or rib. (h) "Letter of certification...
Side 81 - ... d. The handling of a misfired shot shall be under the direct supervision of the mine manager or mine foreman or a competent person designated by him. SEC. 9. Cardox. — a. The provisions governing the handling, storage, and transportation of explosives shall apply to the heater elements of Cardox blasting devices prior to their installation in the shells.
Side 9 - That it shall be the province and duty of said bureau and its director, under the direction of the Secretary of the Interior, to make diligent investigation of the methods of mining, especially in relation to the safety of miners and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances...
Side 55 - Switches and circuit breakers shall be installed so that they are readily accessible and can be operated without danger of contact with moving or live parts.
Side 9 - Interior, to make diligent investigations of the methods of mining, especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention of accidents, and other inquiries and technologic investigations pertinent to said industries...
Side 9 - ... said industries, and from time to time make such public reports of the work, investigations, and information obtained as the Secretary of said department may direct with the recommendations of such bureau. The first annual report of the Director of the Bureau of Mines, issued in 1911, states: The Bureau of Mines was established by an act of Congress (36 Stat., 369) approved May 16, 1910, and effective July 1, 1910. The demand for special recognition and aid from the Federal Government for the...
Side 13 - This table applies only to the manufacture and permanent storage of commercial explosives. It is not applicable to transportation of explosives, or any handling or temporary storage necessary or incident thereto. It is not intended to apply to bombs, projectiles, or other heavily encased explosives.
Side 109 - V2 miles per hour, and potential shall be applied to the cable during tests. The cable will be shifted after each passage of the car, thus giving 100 places in the cable over which two wheels have passed. If the cable fails by short-circuiting or grounding to the rails or wheels at 11 or more places, it will not be listed by the Bureau.
Side 91 - ... square inch. 2. Air lines shall be grounded at the compressor and, if possible, at other lowresistance ground connections along the lines, such as at borehole casings. They shall not be connected in any way to tracks, water lines, or other electric power return conductors and shall be suitably insulated where they cross electric wires or underneath the track. 3.

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