Upper: 1/3 arc length, lower: 1/4 arc length. Both of them are looking good, but I need more evidences. Let's check with the hairpin itself.
上面兩張是1/3圓周的弧度，下面兩張是1/4圓周的。光看線條，1/3的弧度柔和，1/4的大方。有由實物本人來進行比對之必要。
The bronze bar is collapsed and the curve of it is neither even nor smooth, however I am not sure if it was the whole piece damaged in different conditions, or it was just the left side broken. Comparison needed.
New clues are found. I put the hairpin on my drawings and check the curves, and it goes together precisely with the 1/3 arc length. The bronze bar is a 1/3 circle!
Really?
在比對的過程中發現新線索。這支髮簪雖然左邊損壞，不過右邊依舊完好—珠簾完整，所有的線結、串線都沒鬆、沒斷，也沒有斷裂的花片；而主結構青銅棒的弧度，左右兩邊的順暢感很明顯不一樣，但如果只是用左右兩邊的狀況做比對，很難判斷它是受損程度不同，或是只有一邊受傷。
結果，右邊青銅棒的弧線與1/3圓周根本重疊⋯⋯所以它就是1/3圓周了！（嗎？）
我還是試了一下1/4圓周的弧度。1/3圓周的兩端點距離，與1/4的只相差一公分，弧度線條也有部份非常貼近，要是1/4也並非不可能。在試的過程中又發現新證據：
To ensure that, I've tried to make it to fit the 1/4 arc length, and it appears that it is certainly a 1/3 circle. The bronze bar was not only 'fighting' against the force from me but even spilt a little when I was straightening it, and also due to the curve was straightened, the bottom layers that attached to the bronze bar were getting flat and other motif pieces became boring since all the delicacies were flattened out.
主結構青銅棒的線體本身是長方形的，但它並不是平面地往線體的長邊或寬邊直接被彎曲，而是有個斜度（三度空間概念）地彎。這個斜度讓花片的排列有了立體感，也讓珠簾不止是直線條垂墜，而是多了一種圍繞、包覆（頭或髮髻）的感覺。當我試著將青銅棒調整成1/4圓周的弧度，在施力的時候除了明顯地感受到青銅棒本人的「不悅」¹之外，底層花片組也逐漸變得扁平（它們看起來是平的，但是有一種微妙的立體感），其它花片的高低差也開始不對勁。於是我知道，它就是1/3圓周。
Moreover, the bronze bar itself is a rectangular shape flat rod and was bent with an angle, and by doing this ornament has a three-dimension structure (like a sphere). Therefore the bronze bar spilt a bit when I was straightening it because I didn't and couldn't anneal it since it's an object of virtu, and I suppose that I was bending against the structure too.
註¹：當金屬被塑形、並且保持形狀一段時間之後，如果沒有經過退火的程序就又被塑形，會有一種它在抵抗施作力的感覺⋯⋯經過每一次的塑形，金屬分子的結構變堅硬，想要直接再改變它的形狀不容易，必須（重複）退火軟化之後再繼續比較好（對物件與對施作者都是）。不過以修復物件來說，這種「回到起點」的處理方式並不太適合。
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