. Off-hand sketches : a companion for the tourist and traveller over the Philadelphia, Pottsville, and Reading railroad . ANTHRACITE COAL FORMATION. 140. ..^ But the converse of this proposition by no means holds good; forthough the line of dip gives the line of strike, the line of strike doesnot give the line of dip, since there aveiwo lines of dip common to everyline of strike ; and strata having a line of strike running from north tosouth, may dip either to the east or west. In short, as wo havemoved one side of the cover of our book to the right, we can movethe other to the left b, (fig. 3
. Off-hand sketches : a companion for the tourist and traveller over the Philadelphia, Pottsville, and Reading railroad . ANTHRACITE COAL FORMATION. 140. ..^ But the converse of this proposition by no means holds good; forthough the line of dip gives the line of strike, the line of strike doesnot give the line of dip, since there aveiwo lines of dip common to everyline of strike ; and strata having a line of strike running from north tosouth, may dip either to the east or west. In short, as wo havemoved one side of the cover of our book to the right, we can movethe other to the left b, (fig. 34,) while the backof the volume, a, a, remains in the same posi-tion. The terms anticlinal and synclinal linesare frequently used in mining anticlinal line is, simply, that elevatedcentral point from which the strata divergein opposite directions. To illustrate this, wohave only to extend both sides of our volume,as in fig. 35. The synclinal line is exactlythe reverse of the above, being the point atwhich the strata converge towards each illustrate this, we have merely to turn ourbook over, and open it only half-way, exact
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Keywords: ., bookcentury1800, bookdecade1850, bookidoffhandsketc, bookyear1854
