The teeth shape coefficient y is calculated according to the number of shapable gear but not the real number of gear 形系数y是按可成形数计算，而不是按实际数计算。
3.
Besides this , i arriv d at an unexpected perfection in my earthen ware , and contriv d well enough to make them with a wheel , which i found infinitely easyer and better ; because i made things round and shapable , which before were filthy things indeed to look on 此外，令人难以意料的是，我的陶器也做得相当完美。我想出了一个好方法，用一只轮盘来制造陶器，做起来又容易又好看。
