Image: Davis-precursor-2
Size of this preview: 800 × 470 pixels. Other resolutions: 320 × 188 pixels | 1,049 × 616 pixels.
Original image (1,049 × 616 pixels, file size: 9 KB, MIME type: image/png)
Description: Drawing of John Davis' second version of the backstaff or quadrant
Title: Davis-precursor-2
Credit: Own work
Author: Michael Daly
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
Image usage
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