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More by Harold Hayward Clark
Electrical Symbols for Mine Maps
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Electric Lights for Use about Oil and Gas Wells
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Permissible Explosion-proof Electric Motors for Mines: Conditions and Requirements for Test and Approval
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Safety Electric Switches for Mines
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The Factor of Safety in Mine Electrical Installations
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An Investigation of Explosion-proof Motors: Volumes 43-49
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The Electrical Section of the Bureau of Mines: Its Purpose and Equipment
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Ignition of Gas by Standard Incandescent Lamps
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Portable Electric Mine Lamps
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Ignition of Gas by Miniature Electric Lamps with Tungsten Filaments
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Suggested Safety Rules for Installing and Using Electrical Equipment in Bituminous Coal Mines
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Shot Firing in Coal Mines by Electricity Controlled from Outside
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Coal-mine Accidents in the United States and Foreign Countries: Issues 66-72
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Sand Available for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania
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The Wet Thiogen Process for Recovering Sulphur from Sulphur Dioxide in Smelter Gases: A Critical Study, Issues 131-140
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