The 1927 brass sundial and compass.
<video controls autoplay loop style="max-width: 100%;">
<source src="https://diqn32j8nouaz.cloudfront.net/tooltalk_17578800711935.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
1570 Sundial ring - photo
1790 portable compass sundial - photo
17th century portable sundial and compass - photo
3D-printed "digital" sundial - video
Folding wristwatch sundial - GIF
