Watches didn't start to have minute hands until after the invention of the balance spring in 1675. B...
Paul Graham(@paulg) · 商业与创投
Watches didn't start to have minute hands until after the invention of the balance spring in 1675. Before that there was no point. This example is from about 1630. 💬 48 🔄 2 ❤️ 133 👀 25238 📊 46 ⚡ Powered by xgo.ing