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並前往 https://www.alamy.com/the-american-watchmaker-and-jeweler-an-encyclopedia-for-the-horologist-jeweler-gold-and-silversmith-tangents-to-the-wheelcircle-drawn-from-the-centers-of-the-pallets-but-it-happens-that-a-tan-gent-of-45-=-the-radius-and-therefore-the-practical-method-adopted-isto-make-the-pallet-arms-from-the-staff-hole-to-the-center-of-impulse-faceequal-to-the-radius-of-the-escape-wheel-if-we-take-the-radius-of-wheelto-be-==-i-it-will-be-found-that-with-the-pallet-arms-this-length-theheisfht-of-the-pallet-staff-hole-from-the-center-of-the-wheel-will-be-141and-the-horizontal-distance-between-image338925116.html

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