Search U.S. government technical reports digitized or harvested by TRAIL.
Use of the churn drill at lime-plant quarries
Progress report on investigation of detachable rock-drill bits
Hot milling of rock-drill bits at the mines of the Vinegar Hill Zinc Co., Platteville, Wis.
Progress report no. 2 on investigation of detachable rock-drill bits
Progress report 4 on investigation of detachable rock-drill bits
Progress report no. 3 on investigation of detachable rock-drill bits
Relation of dust dissemination to water flow through rock drills
Diamond-drilling blast holes, eastern Magnetite Mine A
Diamond drilling blast holes, Balmat Mine, St. Lawrence County, N.Y.
Shaft sinking by diamond drilling, Bellefonte mine, National Gypsum Co., Centre County, Pa.
Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.
Diamond-drilling blast holes, Eastern Magnetite Mine C
Diamond-bit performance in sandstone
Noise from pneumatic rock drills :analogy studies of muffler designs
Investigations of stresses in a drill bit and rock under static loads
Accuracy in estimating metal content and tonnage of an ore body from diamond-drill-hole data
Drillability studies :statistical regression analysis of diamond drilling
Drillability studies :impregnated diamond bits
Drillability studies-laboratory percussive drilling
Energetics of percussive drills
Effect of organic additives on impregnated diamond drilling
Noise abatement of pneumatic rock drill
Noise reduction of a pneumatic rock drill
Design of a compact muffler for a jumbo drill
Lightweight fiberglass feed leg for hand-held pneumatic percussion rock drills
Abrasive-enhanced water-jet drill for hard rocks
Zero-surface-charge-controlled drilling for enhanced penetration and extended bit life