Might need a friend to help a little, but it's pretty straight forward. Measure the length of the pencil(call it p) and the distance from your eye to the pencil (we'll call this a) in your outstretched hand. Now step back until the pencil appears to be the same height as the tree and measure from your eye to the base of the tree(call it d). Then the ratio of arm length to pencil length is the same as the ratio of distance to the base to height of the tree(h).
a/p = d/h
As an example, let's say the pencil is 10 inches and you hold it 30 inches from your eye, then step back 120 feet from the tree.....
30/10 = 120/h would give you a tree 40 feet tall.
There's an easier way if you know a little trig. Simply measure the distance to the base of the tree and the angle of elevation to the top of the tree. h/d = tangent of the angle so if you multiply the tangent of the angle times the distance to the tree, you get the height of the tree.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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