Four walks addressing the likelihood of remaining in a straight line for ten miles from a single staring point, [bearing left or right as the way presents itself to maintain the same trajectory] returning by the same route and without the aid of a navigational device.

1:   10 miles South and back             30.01.15

2:   10 miles North and back           16.02.15

3:   10 miles West and back               04.02.15

4:   10 miles East and back                 12.03.15

“…and so I closed the door behind me and began one of four possible     perambulations from the crossroads outside that would lead me to walk some ten miles, or thereabouts, in a straight line and thus in to or away from the great metropolis and once there arrived, return by a similar route…”

Extract:      ‘The Diary of William Bull’  March 15th 1793

attrib: William H. David’s ‘The Bull Family of London’ pub. 1847