Bellcrew
Top Poster
VIP Member
The old guess stick would be a mystery to the youth now, precise it wasn't but much better than working longhand.Oooh!.....Geometry! Embedded in my youth as a Regt. Surveyor R.A. We measured angles & Beaings in 'Mils' = 6400 in a circle. Used Log Tables & Slide rules, Sin < Cos< Tan < of Sight.....Etc