Henry Ernest Dudeney/Modern Puzzles/124 - Drawing a Straight Line

by : $124$

 * Drawing a Straight Line
 * If we want to describe a circle we use an instrument that we call a pair of compasses,
 * but if we need a straight line we use no such instrument --
 * we employ a ruler or other straight edge.
 * In other words, we first seek a straight line to produce our required straight line,
 * which is equivalent to using a coin, saucer of other circular object to draw a circle.
 * Now, imagine yourself in such a position that you cannot obtain a straight edge --
 * not even a piece of thread.
 * Could you devise a simple instrument that would draw your straight line,
 * just as the compasses describe a circle?


 * It is an interesting question, but, of course, of no practical value.
 * We shall continue to use the straight edge.