Power pendulum

The desert isn’t lifeless.

Even if there’s none to be measured (in 2003 researchers used Nasa’s scientific techniques to detect life in the heart of the Atacama Desert and found none) when you go and visit you bring your own life with you.

I’ve come to Chile on a business trip for my day job. After finishing the business, according to plan I went out to see the land.

Today I’ve rented a car, bought a few gallons of water, some groceries, and some last-minute long underwear (it may be cold there, I think, on the desert plateau). I began driving inland this afternoon. Now the sun is down and I’m halfway across the country, which isn’t very far to have come considering Chile is pretty narrow East to West.

In my mind, a good road trip involves camping out. So, when I get tired of driving I find a peaceful spot and pull off of highway 24. I’m at an electrical substation, the lights are on but nobody’s here. Good for camping. I think probably nobody will pass through here at night. I mean, from the looks of things this is a remote-controlled setup, there’s probably nobody coming here during the daytime either.

So, in one sense I’m staying off the grid tonight. In another sense, I’m closer to the grid than ever.

According to my research, this place is called Subestación La Cruz, located -22.279427 degrees south, -69.659280 degrees west, 1,155 meters elevation, and 220,000 volts. Wow!

Here it is on the globe:

On the globe, this place is just west of the famous Pan-American highway, so I feel a proud connection with the Americas. From here, I could drive all the way to the extremes of the continents. But right now, I’m right where I want to be.

Here it is on the grid:

Source: CDEC SING
Source: CDEC SING

On the grid, I’m downstream of the coastal coal power plant Norgener, and just upstream of one of the main nodes, Crucero.

This particular branch of power transmission flows east into the interior, same direction I will travel tomorrow.

Here it is on the circuit:

Source: GTD Ingenieria
Source: GTD Ingenieria

On the circuit, this place is at a high electric potential, and right in the mainstream. In one sense, La Cruz, is not the best connected substation – if this was a social network, it only has three friends. On the other hand, in a Zen sense, (where there is no difference between self and other), everything is connected. Of course it is, electrical continuity is implied in any circuit.

And in a biological sense, I’m happily disconnected from the high voltage. Thanks insulators! I wouldn’t want to connect with this circuit.

Instead, I’m out on foot, studying the premises with my trusty camera and six-inch tripod. The night air is still and chill. I can hear the soft crunch of the dusty ground under my feet and the deep hum of the alternating current vibrating the structures above.

I’m captivated by the wildly functional architecture. Sodium vapor lamps illuminate the pieces of electrical apparatus with a soft yellow ochre, the same color of the desert earth by day. Hey, I say, this is just like a Constructivist work from the art history textbooks.

Three phase electrical structures

I contemplate the supposed journey of this electrical energy. Back at the coast, enormous waves are set in motion by a massive, rotating generator, they march across maybe hundreds of kilometers of wire, and a mere fraction of a second later (transmission speed is close to the speed of light) the waves sink and dissipate back into the ground, hopefully having done some useful work with some machine for the customer before disappearing as quickly as they came.

I think about each hapless electron along the way, swinging back and forth, always seeking to restore equilibrium. This of course, reminds me of pendulums, and I think, hey, I’ve got a small toolkit with me, let me construct a pendulum!

The tall power tower which joins the substation to the transmission lines provides the perfect mount. I have a length of thin cord and a small emergency headlamp, and there it is, a swinging light pendulum, ready to make photographic drawings. I’ve found a good project. Now I must pursue it.

The plain pendulum doesn’t seem interesting enough on camera, so partway up the cord, I tie a counterweight – an old galvanized hex nut taken from the ground, likely left over from this tower’s construction. So now it’s a double pendulum, and its curves are much more complex.

I feel the thrill of discovery and spend the next few hours experimenting with the device. I adjust the length of each segment of cord, the viewpoint of the camera, and the launch of the pendulum. There are many good techniques: tossing, spinning, swinging, slinging, dropping, throwing, pushing, pitching. Each time running back and forth from the camera to start a new exposure. To give you an idea of the event, here’s a photo gallery from behind the scenes.

I go on like this for a while, and on my camera’s preview screen, I start to see many good drawings and a few great ones. So now that I’m happy with the result, the cold starts to get to me, and I untie the pendulum, collect my things and enter my little rental car to run the heater for a while then head to sleep.

In theory, the long underwear helped a little bit to keep me warm that night, but it didn’t feel that helpful. I think it was easily overpowered by the cold. Three days later, at the end of my road trip, back to the warmth of the coast, I tear it into pieces for rags which I use with my remaining water to clean a whole lot of desert dust off of this car in hopes of avoiding a cleaning fee.


Power Pendulum (2013)
Light drawings with double pendulum and transmission tower.

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