 | 1907 - 1026 Seiten
...-.">(!' w IS N. r>5°-70° E19 x. :,r,'-7o° \v - - - - _ 27 E.-W. to X. 7.V E. anil N. 75° W .'id .such a mass is left as the head or wall of the quarry. PL VIII, .1, shows a' typical heading on Dix Island. PI. IX, ft, from a photograph taken at the Longfellow... | |
 | Thomas Nelson Dale - 1907 - 240 Seiten
...short as to break up the rock into useless blocks. For a space of 5 to 50 feet the joints may be from 6 inches to 3 feet apart. A group of close joints is...a " heading," possibly because, when practicable, N. 20°-30° E 13 N. 20°-:»° W 8 N. 32°-.r>0° 10 25 N. 35°-50° W 18 N. 55°-70° E 19 N. 55°-70°... | |
 | Geological Survey (U.S.) - 1907 - 244 Seiten
...short as to break up the rock into useless blocks. For a space of 5 to 50 feet the joints may be from 6 inches to 3 feet apart. A group of close joints is...a " heading," possibly because, when practicable, Direction. N. 12° W.-N. 15° E Number of observations. 19 N. 20°-30° E 13 N. 20°-30° W 8 N. 32°-50°... | |
 | Geological Survey (U.S.) - 1908 - 270 Seiten
...short as to break up the rock into useless blocks. For a space of 5 to 50 feet the joints may be from 6 inches to 3 feet apart. A group of close joints is...a mass is left as the head or wall of the quarry. (See Bulletin 313, Pls. VIII, A, and IX, B, also this bulletin, Pl. VI, B.) Headings afford ample ingress... | |
 | Thomas Nelson Dale - 1908 - 458 Seiten
...as to break up the rock into useless blocks. For a space of 5 to 50 feet the, joints may be from 6 inches to 3 feet apart. A group of close joints is...a mass is left as the head or wall of the quarry. (See Bulletin 313, Pis. VIII, A, and IX, B, also this bulletin, PI. VI, B.) Headings afford ample ingress... | |
 | Thomas Nelson Dale - 1908 - 250 Seiten
...short as to break up the rock into useless blocks. For a space of 5 to 50 feet the joints may be from 6 inches to 3 feet apart. A group of close joints is...a mass is left as the head or wall of the quarry. (See Bulletin 313, Pis. VIII, A, and IX, B, also this bulletin, Pl. VI, B.) Headings afford ample ingress... | |
 | Thomas Nelson Dale, Herbert Ernest Gregory - 1911 - 698 Seiten
...fieorge R, Simultaneous joints: Proc. Washington Acncl. Sri., vol. 7, .Inly. 1905, pp. 207-275, PI. XIII. called by quarrymen a " heading," possibly because,...a mass is left as the head or wall of the quarry. (See Bulletin 313, Pis. VIII, A, and IX, B, also Bulletin 354, PI. VI, B.) Headings afford ample ingress... | |
 | Geological Survey (U.S.) - 1911 - 162 Seiten
...F., Simultaneous joints : Proc. Washington Acini. Sci., vol. 7, July, 1905, pp. 267-275, Pl. XIII. called by q.uarrymen a " heading," possibly because,...a mass is left as the head or wall of the quarry. (See Bulletin 313, Pis. VIII, A, and IX, 5, also Bulletin 354, PI. VI, B.) Headings afford ample ingress... | |
 | 1907 - 1200 Seiten
...as to break 'ip the rock into useless blocks. For a space of 5 to 50 feet the joints may be from 6 inches to 3 feet apart. A group of close joints is...a mass is left as the head or wall of the quarry. 1*1. VIII, .1, shows a typical heading on Di.x Island. PI. IX. H. from a photograph taken at the Longfellow... | |
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... in joints consists in their discontinuity or intermittence, their strike and dip for the short spaces in which they occur being uniform. HEADINGS. In some places joints occur within intervals so short as to break up the rock into useless blocks. For... 