Friday, 18 September 2009
Laws of Physics Revision
Fitting took all of two minutes and off I pedalled; what's this, a rougue unit? The direction indicator slew wildly from North to South, at times inexplicably spinning - directionless - like a dog in a butcher's shop.
I should explain at this point that my trusty steed is a classic British roadster, a Humber Sovereign dating from 1951/1952. A distinguished looking upright bicycle, much more suited to York commuting than a day-glo mountain bike.
It differs from a mountain bike in so many ways. 25 fewer gears, classic black enamel, 1950s brakes. It has drawbacks I'll admit but the practicalities of it outweigh the shortfalls. I wouldn't swap it for the daily commute, perhaps at the weekend, but don't let her know.
Back to my problem, why does the compass refuse to settle down and direct me? One word will instantly strike chords with the more scientific of you: aluminium! Modern bikes are mostly constructed of aluminium, a non-magnetic material which does not attract magnetic things like compass needles. My bike is made of good sturdy British steel. Oh well, anyone like to buy a classic black, combination bell-compass?