The Sunwatch! 1920s pocket sundial
10:40
The Sector: the calculator of the 1500s
10:11
H.M. Kala Pocket Sundial - the weirdest time telling device in my collection
8:31
The Underground Clocks of Paris
9:38
Gerbert Abacus Review / HowTo
18:11
Turning a BLOB into PURE GOLD!
16:13
Duracell PowerCheck: A genius idea which didn't last that long
12:20
Pocket Sundial Retorts!
9:54