A simple modification to an existing powder diffraction specimen holder is given to allow for the presentation of filter papers for analysis. A mild steel annulus holds the filter paper in place using magnets added to the rear of the specimen holder.

中文翻译：

---

实验室改良的滤纸粉末衍射标本架

对现有的粉末衍射标本架进行了简单的修改，以提供用于分析的滤纸。低碳钢环带使用添加到样品架后部的磁铁将滤纸固定在适当的位置。