支架采用铸铁浇铸成型，下面配有紧固十字螺钉，可任意紧固在讲台上，进行演示。
Cast iron clamp with screw to fasten the apparatus to rostrum edges at will for demonstration.
螺纹长度可调整的半埋头十字槽螺钉的侧面图。
Side view of raised countersunk posidriv screw with adjustable thread length.
螺纹长度可调整的半埋头十字槽螺钉的侧面图。
Side view of raised countersunk posidriv screw with adjustable thread length.
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