Heron&Fox Photo<p><a href="https://universeodon.com/tags/Jewel" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Jewel</span></a> <a href="https://universeodon.com/tags/bearings" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>bearings</span></a> are synthetic <a href="https://universeodon.com/tags/gemstones" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>gemstones</span></a>, usually <a href="https://universeodon.com/tags/ruby" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ruby</span></a> or sapphire, that are used as bearings, usually <a href="https://universeodon.com/tags/cylindrical" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cylindrical</span></a>. The coefficient of friction between the two ruby surfaces is very small, meaning that little energy is lost to wear on the bearings.<br>The back of this <a href="https://universeodon.com/tags/Soviet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Soviet</span></a>-era <a href="https://universeodon.com/tags/%D0%9C%D0%BE%D0%BB%D0%BD%D0%B8%D1%8F" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Молния</span></a> (<a href="https://universeodon.com/tags/Molnija" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Molnija</span></a> or <a href="https://universeodon.com/tags/lightning" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>lightning</span></a>) shows several <a href="https://universeodon.com/tags/JewelBearings" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>JewelBearings</span></a> on its back.<br>Jewel bearings weren’t a guarantee of craftsmanship, though. Молния <a href="https://universeodon.com/tags/watches" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>watches</span></a> lost around 15 minutes each day.</p><p>Get a print of this image or another at <a href="https://heronfox.pixels.com/featured/jewel-bearing-in-a-molnija-pocket-watch-heron-and-fox.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">heronfox.pixels.com/featured/j</span><span class="invisible">ewel-bearing-in-a-molnija-pocket-watch-heron-and-fox.html</span></a></p><p><a href="https://universeodon.com/tags/PocketWatch" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PocketWatch</span></a>, <a href="https://universeodon.com/tags/SovietMemorabilia" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SovietMemorabilia</span></a>, <a href="https://universeodon.com/tags/Clockwork" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Clockwork</span></a>, <a href="https://universeodon.com/tags/Mechanism" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mechanism</span></a>, <a href="https://universeodon.com/tags/Macro" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Macro</span></a>, <a href="https://universeodon.com/tags/MacroPhotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MacroPhotography</span></a>, <a href="https://universeodon.com/tags/Photograph" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Photograph</span></a></p>