The crossed-ropes acting as ladders to masts on old sailing ships are called?
Jacob's ladder (nautical) the ratlines as well. This is the Jacob's ladder. While they were a popular way of boarding the vessel or carrying out shipside maintenance during the era of wooden ships and even in the 1950s, their use today on board modern merchant ships is minimal due to obvious safety issues. Today, Jacobs ladders are only used to board lifeboats, liferafts and as a draft ladder. Jacob's ladder (nautical) The term Jacob's ladder, used on a ship, applies to two kinds of rope ladders. The first is a flexible hanging ladder. It consists of vertical ropes or chains supporting horizontal, historically
Crossed ladders problem Crossed ladders problem The crossed ladders problem is a puzzle of unknown origin that has appeared in various publications and regularly reappears in Web pages and Usenet discussions. Two ladders of lengths "a" and "b" lie oppositely across an alley, as shown in the figure. The ladders cross at a height of "h" above the alley floor. What is the width of the alley? Martin Gardner presents and discusses the problem in his book of mathematical puzzles published in 1979 and cites references to it as early as 1895. The crossed ladders problem may appear in various forms, with variations