A bit off thread but relevant.
Clock Type Altimeters.
What idiot instrument designer inflicted those intruments on we uncomplaining aviators. Uncomplaining for a long time but with little result until tape instrumentation.
Never in thousands of hours scanning the damn thing could I subconsciously interpret without that extra little bit of mental calculation that the movement of the needle on the right of the dial indicated that the aircraft was actually going in the reverse sense to the needle movement and at odds with the VSI..
Has anyone ever been able to completely retrain the brain to accept this anomoly ?