Not all the towers along a transmission line are identical. Look closely at a tower where the line makes a sharp turn and you will likely find it is wider and beefier than other towers along the route. The added strength and weight are needed to resist the unbalanced pull of the conductors, which might overturn an ordinary tower. These special towers are called deviation or angle towers.
The transmission-line tower everybody knows is an Erector Set latticework of steel girders and diagonal braces. The techniques for designing and building these towers are the same ones used in constructing steel bridge trusses or crane booms. The individual pieces can be made cheaply from rolled steel and then bolted together on the site. This last point is more important than it might seem: transporting a fully assembled tower 100 feet tall is an awkward and expensive business.
Taking notes has always helped me zero in on the interesting questions.
In taking field notes, the way to find these peculiarities is to keep track of as many observations that may not appear at the time to be relevant at all.
I’ve been keeping journals of one sort or another since I was a teenager, and if there is one thing I can now confidently say about all this scribbling and note-taking, it is that if it wasn’t written down, it didn’t happen. The more I wrote the more that did happen, because all this process stirs up ideas. Stopping to sit and write costs time and energy, and some biologists feel that it should be discouraged.
Note-taking helped transform me from a young boy on barefoot runs who passively observed the tangled bank of the Maine woods into a naturalist-scientist who is an active participant in unraveling the mysteries of the natural world.