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Can I tie a knot on a foot-long rope that is one inch thick? In terms of ropelength, this asks if there is a knot with ropelength 12 {\displaystyle 12} . The answer is no: an argument using quadrisecants shows that the ropelength of any nontrivial knot has to be at least 15.66 {\displaystyle 15.66} . [ 1 ]
Alternatively, 1 metre (3 ft 3 in) of string is spliced into the original string, and the extended string rearranged so that it is at a uniform height above the equator. The question that is then posed is whether the gap between string and Earth will allow the passage of a car, a cat or a thin knife blade.
The Byzantine equivalent, the schoinion or "little rope", varied between 60 and 72 Greek feet depending upon the location. The Thai sen of 20 Thai fathoms or 40 m also means and is translated "rope". The Somerset rope was a former English unit used in drainage and hedging. It was 20 feet (now precisely 6.096 m). [1] [2]
A cable in this usage cable is a thick rope or by transference a chain cable. [1] The OED gives quotations from c. 1400 onwards. A cable's length (often "cable length" or just "cable") is simply the standard length in which cables came, which by 1555 had settled to around 100 fathoms (600 ft; 180 m) or 1 ⁄ 10 nautical mile (0.19 km; 0.12 mi). [1]
In practice, however, the hangmen ignored this table and used considerably longer drops. A significantly revised edition of the Table of Drops was published in October 1913, allowing 1,000 foot-pounds force (1,400 J) of drop energy – and then from 1939 executioners routinely added nine more inches (23 cm) to the drop in the 1913 Table.
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