Image: Hales Stephen trough
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Original image (653 × 1,175 pixels, file size: 230 KB, MIME type: image/jpeg)
Description: Scan from an old book, showing a pneumatic trough
Title: Hales Stephen trough
Credit: Vegetable Staticks (opposite page 262)
Author: Stephen Hales
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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