ground log

noun

, Nautical.

a lead weight attached to a line, cast overboard in shoal water and allowed to pay out freely to show the speed of a ship and the force of the current.

Use the ax to split out the upper half of the ground log, between the saw-cuts and also the upper half of the log D.

Then from B down to half-way through the log D; now continue from G, cutting down to half through the ground log.

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