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...ng_fig1.png|Figure 1]]). Electrical energy for the system is provided by a battery pack or generated by a small turbine. In a battery pack MWD system, information is recorded and stored downhole in the micropr

...ent flow in the wire windings in the alternator, which in turn charges the battery. In the case of an MT survey, the “wire” is the earth.

...designed core barrel and nonmagnetic drill collar with a compass, camera, battery pack, and timer.<ref name=pt03r41>Rowley, D. S., C. A. Burk, T. Manual, and ...nted at the top of the inner core barrel, inside a nonmagnetic collar. The battery-driven timer is set prior to running in the hole to expose a frame of film

...lker, 1976, Development of a braided-fluvial facies model for the Devonian Battery Point Sandstone: Can. Jour. Earth Sci., v. 13, p. 102-119.