Sundial Ring and Nocturnal: Does Anyone Have the Time?
10:11
H.M. Kala Pocket Sundial - the weirdest time telling device in my collection
8:45
Build an Ancient Astronomical Instrument
8:47
The Sunwatch! 1920s pocket sundial
16:49
Iceland Spar: the Mineral That Changed Science
10:36
Beeman's Gum: the Gum of Pilots
12:20
Pocket Sundial Retorts!
7:20
A DIPTYCH SUNDIAL
8:31