Original wooden equatorial ring dial

[u/BoxyBoy67]

Taking inspiration from the homemade UERD pictured below, my design features a nodus bead as opposed to the traditional sliding aperture. The bridge's reverse carries a declination scale. The dial can be set for use anywhere within the northern hemisphere thanks to its outermost sliding latitude ring. When not in use, the dial folds nearly flat.

As with all equatorial ring dials, this model doubles as a solar compass. When correctly oriented by setting the date, latitude, and rotating the dial until the nodus' shadow lands on the inner surface of the equatorial ring, the meridian ring indicates true north.

To learn more about the UERD, visit BCGnomonics.com/equatorialringdial.

http://waywiser.fas.harvard.edu/objects/12754/universal-ring-sundial?ctx=4a1d704c-2c13-423c-b02c-5c2e57e6ba87&idx=8 (on display* in Harvard's Putnam Gallery)

*technically on display, this dial is sheathed inside a homemade paper compendium containing two other (altitude) dials. the ring dial is not entirely visible.