尖晶石

The quarrymen usually had to pay a rent or royalty to the landlord, though the quarrymen at Cilgwyn did not. A letter from the agent of the Penrhyn estate, John Paynter, in 1738 complains that competition from Cilgwyn was affecting the sales of Penrhyn slates.

除了在Cilgwyn，采石工在其他地方通常需要向场主支付租金或使用费。1738年，彭林采石场经纪人约翰·佩因特写信抱怨Cilgwyn的竞争影响了彭林板岩的销售。

Zinc and body fat contents were determined by stomic absorption spectrometer and gravimetrically, respectively.

锌浓度及体脂肪含量分别以原子吸收光谱仪及比重法测定。