| 摘要 |
A tubular golf club shaft is formed with an area made of fiberglass through which you can see. A swing speed indicating device is fastened inside the shaft and visible through a fiberglass area so that you can read the speed indicated on the device. When the shaft is swung, an indicator moves inside the shaft to position an indicator along a scale on the shaft or the device so you can read various parameters derived from the velocity with which the club is swung. The shaft is formed by inserting a strip of translucent material such as fiberglass to overlap with adjacent strips of graphite material that form the shaft.
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