Manual of Petrographic Methods
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In our eReader you can find the full English version of the book. Read Manual of Petrographic Methods Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Manual of Petrographic Methods
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BECKE METHOD FOR DETERMINING GRAPHICALLY THE AXIAL ANGLE IN SECTIONS WHICH DO NOT SHOW THE POINTS OF EMERGENCE OF BOTH OPTIC AXES (1894) 418. Determination of the Point of Emergence of an Optic Axis.
Becke's 1 method for the determination of axial angles was developed from a method for determining the point of emergence of an optic axis. The meas- urement of the angle will be more readily understood if this is previously explained.
If one rotates the two nicols simultaneously and leaves the sta...ge station- ary, the only spot which will remain continually dark is the point of emergence of an optic axis. 2 If the stage is rotated instead of the nicols, the point of emergence of the optic axis will rotate in the same direction, following the path of the former but without movement of its own (Fig. 68 1). If, now, one can accurately locate the isogyre in two positions, their intersection will give the point of emergence of the optic axis.
To fix the position of the isogyre correctly in any position, it is sufficient to determine the distance from its nearest point to the center of the field of view, and the two points where it touches the periphery.
What to read after Manual of Petrographic Methods?
You can find similar books in the "Read Also" column, or choose other free books by Albert Johannsen to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
BECKE METHOD FOR DETERMINING GRAPHICALLY THE AXIAL ANGLE IN SECTIONS WHICH DO NOT SHOW THE POINTS OF EMERGENCE OF BOTH OPTIC AXES (1894) 418. Determination of the Point of Emergence of an Optic Axis.
Becke's 1 method for the determination of axial angles was developed from a method for determining the point of emergence of an optic axis. The meas- urement of the angle will be more readily understood if this is previously explained.
If one rotates the two nicols simultaneously and leaves the sta...ge station- ary, the only spot which will remain continually dark is the point of emergence of an optic axis. 2 If the stage is rotated instead of the nicols, the point of emergence of the optic axis will rotate in the same direction, following the path of the former but without movement of its own (Fig. 68 1). If, now, one can accurately locate the isogyre in two positions, their intersection will give the point of emergence of the optic axis.
To fix the position of the isogyre correctly in any position, it is sufficient to determine the distance from its nearest point to the center of the field of view, and the two points where it touches the periphery.
What to read after Manual of Petrographic Methods?
You can find similar books in the "Read Also" column, or choose other free books by Albert Johannsen to read onlineMoreLess
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