@martin_au Yes, I bought one on eBay as soon as they came out. It shows time in 20 minute increments. It is made by 3D printing and they come from th...

@holy-cow?ÿ Both poles had parallel shadows pointing at the same solar time, but you can write any number you want on the dial. Before the telegraph ...

Some dials can be used at night for taking the azimuth of celestial bodies and you need a flashlight indeed to read the?ÿdial. Look up the Abrams SC-1...