RepAiRing pROject : Tian-Tsui hairpin , the bronze bar。點翠髮簪，紀錄（八）。

It's time to find out how the bronze bar looked like.

概略地測量了各髮簪部件的尺寸，其中最重要的就是身為主結構的青銅棒，它的弧度決定整支髮簪的樣貌。但原來的弧度是什麼樣子呢⋯⋯？

只能推測了。數學課開始。

As the main structure of the ornament, the bronze bar is the most important part and would make the hairpin looks very different if the curve varies. Since I haven't got any photo of the hairpin, I think it would be easier if I considered that the bronze bar is an arc length of a circle then find out which circle is the most reasonable, and beautiful to it.

既然青銅棒是弧形，那麼就把它當成圓周的一部份來看待。我設定了幾種青銅棒vs.圓周長度的比例，再用3.14找出每個圓的直徑，然後與底層花片的長度比對，選擇最適合的弧度（畢竟無法確定它原本的模樣）。似乎有點多此一舉，但是覺得如此一來，之後在調整青銅棒弧度的時候比較有依據，線條會比較順、也比較美。

So I did some math and checked with the motif sizes at bottom layer, and decided that the bronze bar is either a 1/3 or a 1/4 circle (the other two choices are 1/2 and 2/5, but NG). Let's try and see.

最後在1/3與1/4圓周長度之間做選擇。兩者各有它獨特的氣質，實際調整的時候再決定（陷入障礙XD）。

其它的選擇是1/2與2/5。1/2圓周長度的兩端點距離比現在的還窄，2/5的兩端點距離的則是與現在的寬度幾乎相同，都不適合。

To be continued.