Johann Willebrand, Horizontal sundial, brass and silver, Augsburg, ca. 1720.
<p>Height = 10,2 cm; Width = 15,8 cm
</p>
Mathematisch-Physikalischer Salon D I 120
<a href="//commons.wikimedia.org/wiki/User:Ad_Meskens" title="User:Ad Meskens">Ad Meskens</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>