Image: HD Actinograph
Size of this preview: 493 × 600 pixels. Other resolutions: 197 × 240 pixels | 721 × 877 pixels.
Original image (721 × 877 pixels, file size: 217 KB, MIME type: image/jpeg)
Description: I took this picture of my Hurter & Driffield's Actinograph, a boxwood/brass/cardboard two-slide slide rule.
Title: HD Actinograph
Credit: Transferred from en.wikipedia
Author: Original uploader was Dicklyon at en.wikipedia
Permission: Released into the public domain (by the author).
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
The following page links to this image:
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