In a nutshell, this method used a plank of wood (usually wedge shaped and weighted on one end so it would float perpendicular to the water to increase drag) tied to a long thin line that had knots tied at evenly spaced intervals. The wood would be tossed into the water and the line ...
所属专辑:Sophia英语小百科|I Wonder Why 声音简介 About 400 years ago a ship’s speed was measured with a log tied to a knotted rope. The sailors threw the log overboard, and counted how many knots unwound as the ship moved forward. They used a sandglass to time it accurately. Sailors ...
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3. Why is the term knots used? The knot was a term earlier used as a length measure on the vessel’s log lines, which were used to measure the speed of a ship on the water. This line was marked at intervals by knots tied in the rope. 4. Why do sailors use knots? The simple ...
in a fall). By doubling the runner through the cam’s sling (fig. 3, this works for wires, too) you’ll shorten the extension. Pick just the extension you need and no more. For long routes, speed of placement and re-racking is important. To move fast, add a few extra biners to...