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2. Pitometer log - Wikipedia

   en.wikipedia.org/wiki/Pitometer_log

   Impeller log:A variation of this approach is known as a patent log, which is towed from the stern of a ship. The patent log includes a mechanical register that counts the log's rotations as it is being towed. The patent log was invented in 1688 by the English instrument maker Humphry Cole. The patent log is also known as a screw log or taffrail ...

3. Pit sword - Wikipedia

   en.wikipedia.org/wiki/Pit_sword

   The pit sword (also known as a rodmeter) is a blade of metal or plastic that extends into the water beneath the hull of a ship. [1] It is part of the pitometer log , a device for measuring the ship's speed through the water.

4. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   SPFM – single-phase flow meter; SPH – SPH log [clarification needed] SPHL – self-propelled hyperbaric lifeboats; SPM – side pocket mandrel; SPM – strokes per minute (of a positive-displacement pump [citation needed]) spm – shots per meter (perforation density [citation needed]) SPMT – self-propelled modular transporter

5. Chip log - Wikipedia

   en.wikipedia.org/wiki/Chip_log

   A chip log, also called common log, [1] ship log, or just log, is a navigation tool mariners use to estimate the speed of a vessel through water. The word knot , to mean nautical mile per hour , derives from this measurement method.

6. Shovel logging - Wikipedia

   en.wikipedia.org/wiki/Shovel_logging

   Logs further from the road can be shoveled to the landing in a few passes back and forth. Skidding and cable logging can be more cost efficient for logs further from the road. Shovel logging can make use of the loader between log truck arrivals. It can also reduce soil disturbance, since it requires only a single pass to move all the logs in reach.

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9. Saw pit - Wikipedia

   en.wikipedia.org/wiki/Saw_pit

   A saw pit in use near Kalomo, Zambia, in 2007. A saw pit or sawpit is a pit over which timber is positioned to be sawed with a long two-handled saw, usually a whipsaw, by two people, one standing above the timber and the other below. [1] It was used for producing sawn planks from tree trunks, which could then be cut down into boards, pales ...