energy
Tracing Power Lines with the Pylon Appreciation Society
Pylons
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.
A haunting, syncopated music
"Rappers" on the roof of the electrostatic precipitator knock the accumulated dust free, letting it fall into the storage hopper. Each rapper is the size and shape of a baseball bat. Inside is an electromagnet that pulls a steel plunger upward, then allows it to fall again, producing a sharp knock. The rappers are energized at seemingly random intervals, producing a haunting, syncopated music. (The rhythm seemed more modern jazz than rap.)
Safety cut rope axe man
In the first nuclear reactor, constructed by Enrico Fermi in 1942 under the bleachers of the University of Chicago football stadium, the control rods were held up by a manila rope. A man with an axe was told to cut the rope if the reactor got out of hand. This "safety cut rope axe man" is supposedly the origin of the term SCRAM for an emergency shutdown procedure.
Color coding
Telephone wires erupt in a multicolor cascade in a ground-level, pedestal-type splice case on a city street.
Dividing the set of 10 colors into two contrasting groups of 5 allows for exactly 25 combinations with one color from each group; thus, each pair in a bundle can be uniquely colored. A similar color code is applied to the ribbons that bind together all the pairs in a bundle, and to those of the superbundles. The result is highly festive! A specific wire might be identified as the blue-red conductor within the orange-black bundle within the brown-yellow superbundle.
On the Winds
On the Situations and Names of the Winds is the title of a fragment of a pseudo-Aristotelian treatise, most likely written by a later author of the Peripatetic school. The two-page work identifies and briefly describes the names not just of the four anemoi, but gives a wind-name to each of the twelve points of the so-called “wind-rose”, slightly less poetically the “compass rose”, which is the figure seen on classical nautical charts and maps that shows the cardinal points as well as points intermediate.
...In both agricultural and maritime settings, the names of the winds were at once practical and phenomenologically basic: to step outside and to feel them was to know how things were in the most basic sense, to “know which way the wind is blowing”, as we still vestigially say, and to find the language to speak of it.
...If I were ever permitted to teach a course on the philosophy of wind, I would begin with the questions: How did the winds lose their names? And what does it mean for us to live in a world of nameless winds? I step outside and I feel a gust. “That’s wind,” I think to myself, and I have nothing more to add beyond that. I don’t know the winds.