The drawing only for a small pocket size portable ring dial (or poke dial) which tells the time from the sun’s altitude. All brass construction. One sheet of drawings plus a four page explanatory leaflet. You will need a pocket calculator with trig functions (or a book of sine tables) to calculate the sun’s altitude for your latitude.
Full instructions are given to build this relatively simple device, and on how to use it.
Impress your friends with this little “toy”.