Letter Re: Protractors for Field Engineering
Jim: Now I know some folks aren’t going to think of a protractor — digital, analog, or constructed — as a survival tool. But in the USAF survival school certain “angles” were reinforced as survival angles. Support a load with an equilateral triangle. Making a 30-60-90 frame to support a trench. An isosceles to ensure that snow and rain shed away from a survival shelter. And, squares for identifying your location to rescuers. (Sinces traight lines are out of place in nature. ) Of course as an engineer, anytime you build, angles come into play with load. A good analog …