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30 Bit wear .. Decreased 10 to 35 pct . 26 , 30 Drilling rate .. Increased 20 to 60 pct . 26 , 30 Rock hardness .. Decreased ..... 30 Rock strength .. Decreased 9 to 20 pct .. 30 Igneous rocks 12 .1 - Bit life ..... Increased .
30 rock 36 . 38 . 3.5 . noch 33 . 33. rock roch 36 . 36. rock 39 . 38 36 36 . 40.34 rock 30 . roch 34 . 36 . 40 . 40 . rock 34 34 . ... 30 . 34. rock 41 . 32 30 . 40. rock rock 36 30. 24. rock roch 19. 20 . gröck 28 30rock 30 rock 25 .
140 Rock , medium . 150-200 150-200 Limonite , ore . 200 100-200 Ore , soft - medium . 15-100 Rock , medium . 50 120 Ore , medium . 60-70 150 Do. 25-30 3-4 Rock , hard . 200-300 100 Ore , soft . 45-50 15 Ore , hard .
m2 Bottom Type Depth ( cm ) L - 1 2a / 20 1,731 15 Silty - sand , gravel L - 4 2a / 17 1,285 15-30 Bedrock , cobbles L - 5A 1 11 217 15-30 Rock , cobbles , gravel C 1 10 240 15-30 Rock , cobbles , gravel L - 6 1 17 304 15-30 Rock ...
m2 Bottom Type Depth ( cm ) June 11 , 1969 L - 1 20 1,731 15 Silty - sand , gravel L - 4 17 1,285 15-30 Bedrock , cobbles L - 5A 1 ון 217 15-30 Rock , cobbles , gravel С 1 10 240 15-30 Rock , cobbles , gravel L - 6 1 17 304 15-30 Rock ...
335 17 30 4 Till 157 8/1/46 110 4/24/36 Till Rock , at 0-17 17 Domestic . Low in fall . 320 100 6 3-4 30 8/46 Hard Rock Till Rock 0-8 8-100 Domestic . 335 500 6 Hard 2-3 1915 Rock Till Rock 0-25 25-500 Drinking , 100 people several ...
Rock drills , Automatic air - feed regulator for . F. M. Slater . 1,543,883 ; June 30 . Rock drills , Cushioning device for . L. C. Bayles . 1,554,776 ; Sept. 22 . Rock drills , Feeding mechanism for . H. V. Haight .
Rock and lock drill . J. Arthur . 2,288,509 ; June 30 . Rock drill . M. G. Edwards and F. M. McKinley . 2,288,075 ; June 30 . Roller having surface of sponge rubber knobs . G. R. Eckstein . 2,287,768 ; June 30 . Rolling machine , Draw .
... Change Column 5 to read Stockton Lightstation , California 121 17 30 W 37 58 30 N ( change in designation of nia ... 7a to read 2.5 Rock , California Change Column 6 to read ALA 2 ; Column 7a to read 3.0 ; Column 10 to read 30 Rock ...
... highest Foel Dregarn 103 9 point 33 22 30 Precelly Top 70 30 45 58302 Precelly Top o 67142 Nipple Rock 75 5 151 56878 Brenin Fawr 101 23 048542 Rock near ' Trecoon Farm 34 24 Ferwig Steeple 33 29 Brenin Fawr 10 54 056352 Precelly ...