指定钻杆和钻头柄的连接尺寸。此外，还给出了湿式钻井的一个实例。以毫米和英寸为单位列出尺寸表；一些图说明了关注的形状和参考数量。

Specifies the connecting dimensions for drill-rods and the shanks of drill-bits. In addition, an example is given for wet drilling. Tabulates dimensions in millimetres and inches; some figures illustrate shapes and reference quantities of concern.