File:Screw demonstrator.png
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Screw_demonstrator.png （538 × 350像素，文件大小：31 KB，MIME类型：image/png）
摘要
| 描述 |
English: Drawing of a simple machine to demonstrate the action of a screw, from a 1912 scientific instrument catalog. It consists of a threaded shaft, threaded through a stationary mount. As the crank on the left is turned, the shaft moves axially through the hole. |
| 日期 | |
| 来源 | Downloaded 2011-02-15 from Physical Apparatus Catalog No. 50, Max Kohl A.G., Chemnitz, Germany, 1912, p. 313, fig. 52237 on Instruments for Science 1800-1914 collection, Smithsonian Institution website |
| 作者 | 未知 |
| 授权 (二次使用本文件) |
Public domain in USA - Published in USA prior to 1923 |
许可协议
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文件历史
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| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 2011年2月16日 (三) 20:16 | | 538 × 350（31 KB） | wikimediacommons>Chetvorno | {{Information |Description=Drawing of a machine to demonstrate the action of a screw, from a 1914 scientific instrument catalog. |Source=Downloaded 2011-2-15 from [http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/ |
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