File:JohnWall.jpg
Size of this preview: 450 × 600 pixels. Other resolutions: 180 × 240 pixels | 360 × 480 pixels | 576 × 768 pixels | 768 × 1,024 pixels | 1,704 × 2,272 pixels.
Original file (1,704 × 2,272 pixels, file size: 448 KB, MIME type: image/jpeg)
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Dimensions | User | Comment | |
---|---|---|---|---|
current | 05:10, 23 May 2010 | 1,704 × 2,272 (448 KB) | Tamasflex | {{Information |Description={{en|1=ohn Wall. Retired design engineer Inventor of the Crayford focuser. ATM, optical research , painting, making things. Writing articles. Inventor of the Zerochromat retrofocally corrected refractor, discoverer of a new |
File usage
The following page uses this file: