Column Mother Steadfastly ‘True North’ I’ve just spent an hour upstairs in, so far, a fruitless search. The search was for an object about as round as a half dollar, and it weighs not much more. Olive drab, its metal case has a cracked glass face. Inside it, a needle trembles on a center post. The needle, as it has for over a century, points true north. You can’t fool that needle by turning the case so that the printed…