The Sunwatch! 1920s pocket sundial
13:24
Equameter Review / HowTo
10:11
H.M. Kala Pocket Sundial - the weirdest time telling device in my collection
8:31
The Underground Clocks of Paris
10:22
Hexadecimal mechanical calculator from the 1970s
1:16:39
The Curta Calculator (full documentary) Review / How To
11:14
Walther made a calculator! Walther WSR-160 Review / HowTo
11:48
The compass no one knows how to use
52:00