6:36 I love it, counterbalanced pendulums "self-canceling" so I think maybe good on an ocean ship counterbalanced against the waves in one plane, but how could you counterbalance for another plane like North-South AND East-West? Reading Wikipedia I see now there's a whole lot of technology stuffed into the chronometer problem. sorry I bothered you. Video is still interesting. Thanks.
2:40 look at the spinning gear to the lower right. NOT concentric but rather friction sliding gear to gear sliding. All visible sliding absorbs energy from friction.