I mentioned a full size replica of Tycho's sextant. There is a
picture of it on the web. See <http://www.turistik.cz/en/pruvodce/cil/
museum-benatky-nad-jizerou/detail/>. The sextant is the instrument on
the right in the photograph. This museum has much more to offer. It
was built in an old building using lots of European money.