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→Mechanical orientation techniques
==Mechanical orientation techniques==
==Mechanical orientation techniques==
The industry standard for many years has been a mechanical orientation technique utilizing a specially designed core barrel and nonmagnetic drill collar with a compass, camera, battery pack, and timer<ref name=pt03r41>Rowley, D. S., Burk, C. A., Manual, T., Kempe, W. F., 1971, Oriented cores: Christensen Diamond Products Paper, 15 p.</ref>. A typical assembly is shown in Figure 1.
The industry standard for many years has been a mechanical orientation technique utilizing a specially designed core barrel and nonmagnetic drill collar with a compass, camera, battery pack, and timer.<ref name=pt03r41>Rowley, D. S., Burk, C. A., Manual, T., Kempe, W. F., 1971, Oriented cores: Christensen Diamond Products Paper, 15 p.</ref> A typical assembly is shown in Figure 1.
[[file:core-orientation_fig1.png|thumb|{{figure number|1}}Typical assembly for mechanically orienting core.]]
[[file:core-orientation_fig1.png|thumb|{{figure number|1}}Typical assembly for mechanically orienting core.]]