目的：
检验成品灯上E14灯头螺纹*小外径（尺寸d）。
PURPOSE:
To check the minimum outside (major) diameter of the screw thread, dimension d, of E14 caps on finished lamps.
检验：
当量规套在成品灯（灯头向上）的灯头螺纹上时，灯头中心触点不应凸出量规的X面。检验仅利用量规的自身质量进行。
TESTING:
When the gauge is placed over the thread of the cap on a finished lamp, held cap uppermost, the centre contact shall not project beyond surface X. Only the weight of the gauge itself shall be used in the test.
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