Getting to the Cashews

Or: Why the Big Nuts Always Rise to the Top

That's me, looking for cashews.

Anyone who's worked in shipping—or anyone who has ever opened a jar of mixed nuts—has experienced the same thing, over and over again: When you're moving a jumble of little stuff, the big items (or Brazil nuts) always end up at the top.

At first glance, it seems simple enough: the smaller stuff can just fit down into the holes between everything else. Problem solved. Except...if that were true, then the small stuff would be at the bottom but the big stuff would still be scattered all the way through.

Well, what about density? If the big items are just less dense, they'd pop right to the top, yes? Well, sometimes, though much denser large objects also tend to rise to the top. It's only the items with a slightly different-than-normal density that remain scattered throughout.

In order to understand this, we need to view it a bit differently. Let’s approach it in terms of convection. In a liquid, temperature and pressure differentials can create convection currents that move particles around in huge looping patterns. If you treat the mixed nuts as a fluid, convection actually starts to accurately model what's going on. (Scientists call it granular convection.)

As it turns out, both of our previous ideas were almost right. As we move the box around and shake its contents, we force the particles in the middle upward in a current. The particles on the sides then fall into the gaps left by the rising particles in the center. Which is where our first idea comes into play: the smaller particles can fit down into the new gaps more easily, leaving the biggest ones on top.

Found 'em.

Found 'em.

We still have the density issue confusing things, though. And this we can't solve quite as easily. We know what happens, and we have an idea how it happens (weirdly enough, density doesn't particularly affect granular convection on this scale if the mixture is in a vacuum), but we still haven't put our fingers on all the whys.

One thing is for sure, though: Cashews are definitely the best. You'd have to be a fool to think otherwise. (Well, the almonds can stay, too.) Brazil nuts and all the rest are just something you have to endure for the sake of the cashews.

_________

Quotable

Good thing people never run out of things to say. My Quote-Off with that other Yard Ramp Guy continues:

“God gives the nuts, but he does not crack them.”

— Franz Kafka

Building a Cathedral

Don Justo, with Gusto

Don Justo at age 85

Don Justo at age 85

Some people’s work ethics are entirely too formidable. I'm by no means a lazy man, but sometimes even I like to relax and spend an entire day on the lake with a fishing pole.

Not Justo Gallego Martínez. Known also as Don Justo, he is a former monk, living in Spain, and he’s been building his own cathedral for decades.

After eight years of living in a Trappist monastery, he left the order due to tuberculosis. And he promised himself that he would build a shrine if he recovered. Don Justo started work on the cathedral in 1961.

Martínez's work begins each morning at 6 AM and lasts for about ten hours a day. He takes off only on Sundays. He has missed but a handful of days during the decades of the cathedral’s construction, and he’s done the vast majority of the work completely alone, though he does have a helper these days.

When he started, there was no plan. He just leveled the ground and started building. To this day, he regularly changes the design, according to inspiration or whim. The cathedral doesn't have any planning permissions from the city of Mejorada del Campo, nor does it have the blessing of any part of the Catholic Church.

Despite the lack of city permissions, Don Justo hasn't had to deal with any real trouble from the city. Most residents are quite proud of it, though a small number consider it an eyesore.

Most of the materials he uses for construction are recycled. Local construction companies and a nearby brick factory frequently donate excess material to the project. Frequently, he also folds everyday objects into the design. For example, he molded his columns with old oil drums.

I've thrown up a few sheds in my life, but a whole cathedral? I don't have a fraction of the ambition to handle that. And then there’s Don Justo, who doesn't even use a crane. And he's 90 now. Not for me.

_________

Quotable

That other Yard Ramp Guy keeps on quoting, and, I must say, his choices are pretty good, if a bit too tilted toward sports. Oh, well. As Michael Jordan said, “Just play. Have fun. Enjoy the game.” So, en garde, Yard Ramp Guy:

“If opportunity doesn’t knock, build a door.”

— Milton Berle

 

Cable is the Real Web

Link This

McCoy Fields underwater cables

I've heard everyone—from my coworkers to the news outlets—describe ours as a wireless society. Nothing could be further from the truth.

A fun little statistic: In 2006, we transmitted less than one percent of all international data traffic via satellite. The percentage is a little higher today, but we continue to route the overwhelming majority of data through undersea fiber optic cables that stretch between every continent except Antarctica. Countries around the world consider them absolutely vital to their economies.

We've been laying underwater cable for a long time. Those first put into service were telegraphy cables, laid in the 1850s, though experimentation with the cables went back as far as the early 1840s (just a couple years after the invention of the telegraph). And during the Cold War, the United States and the Soviet Union tapped into and cut each others' cables.

Laying the cables today is immensely expensive. We spend billions of dollars each year on the process. And, while the cost has gone down a bit, it's still normal to see price tags hitting tens of thousands of dollars per mile.

Submarine cables also break, and they break frequently. Fishing trawlers, anchors, earthquakes, turbidity currents (giant underwater landslides), and shark bites are all major causes of these breakages. We're not entirely sure why sharks like biting them so much.

Repairing them is a difficult and costly process, involving specialized repair ships that lower grapples to lift the broken ends of the cables to the surface for repair. We employ different types of grapples, depending on the seafloor around the break (for example: rocky vs. sandy). In shallower waters, we can use submarines to repair the cables.

Politicians thrive on producing drama about literally anything. While drama over oil and such tend to hog most of the media attention, submarine cables are a really big deal.

_________

Quotable

I see that that other Yard Ramp Guy has started offering up quotations in his weekly blog. Always up for a challenge and, um, not to be outdone, I challenge him to a Quote-Off. En garde.

“Beware of all enterprises that require new clothes.”

—Henry David Thoreau

 

Transport Innovations

Or: The Vertical Vega

vegaThe second car I ever owned was a used Chevy Vega. Despite it being a complete rust pile that broke down on a monthly basis, I loved that car. (Well, it did cure me of any later desire to become a gearhead; I like cars, but that thing really took the joy out of my tinkering with fixing engines.)

I'm not here to complain about the defective axles, self-incendiary tendencies, leaky engines, backfiring, etc. I want to talk about the single coolest feature of the Vega: the way it was shipped.

These days, we're used to cars being hauled down the road by semis, but in the 70s they were hauled on railway flatcars—the longer 85- and 89-footers. They could pack 15 cars onto those tri-level racks, but it didn't even come close to the maximum weight per flatcar.

The price to move a loaded railcar from the assembly plant to the Pacific coast was about $4,800. At more than $300 per car, Chevy wanted to push that price down quite a bit.

And Chevy ended up with a pretty novel solution: shipping them vertically, nose down. They designed a specialized rack for the Vega known as the Vert-A-Pac, allowing an 89-foot flatcar to hold as many as 30 cars.

Chevy still wanted to ship them all topped off with fluids, but any normal car would leak all over the railroad. Chevy designed the Vega specifically to prevent leaks during vertical shipping. This included innovative alterations like a special engine oil baffle, battery filler caps, and a windshield wiper bottle set at a 45-degree angle.

In 1970, after Chevy discontinued the Vega, they also discontinued the Vert-A-Pacs because they were exclusively designed for Vegas.

All scrapped—vehicle and its innovative shipment method, which was repurposed.

Yes, my bias here, though I think this was one of the rare events where the way a company shipped something was much better than the thing itself.

vpac

Raising a City

Or: Did That Building Just Run a Red Light?

Stay with me on this one: yes, it begins on a pretty sour note…but I promise you there’s a happy ending.

Nineteenth century Chicago was plagued by, well, plagues. Epidemics of typhoid fever, dysentery, and cholera repeatedly hit the city. The 1854 cholera outbreak killed six percent of the entire city's population.

The reason for those diseases, and a common culprit throughout history: poor-to-nonexistent drainage. Standing water in a city makes a perfect breeding area for all sorts of nasty illness. In fact, disease historically was so bad that the majority of medieval cities experienced negative population growth—more people died of diseases than were born.

The only reason cities didn't depopulate was a near constant influx of immigration from the country. This changed steadily around the world when city infrastructure and medicine improved. Disease was still quite common in the 19th century, but Chicago's level of disease was quite unusual in an American city for the time.

In 1856, an engineer named Ellis S. Chesbrough developed a plan for a city-wide sewer system that would solve the problem. It was unusually ambitious: he wanted to raise the entire city six feet, then build sewers below the newly raised buildings.

Sounds insane, right? That's what I thought, too, except they actually did it—raising the first building in January 1858: a four-story, 70 foot long, 750-ton brick structure lifted on two hundred jackscrews to its new level, without the slightest damage. Engineers boosted more than 50 masonry buildings that year alone.

In 1860, a team of engineers actually managed to raise up half a city block in one go—an estimated 35,000 tons lifted nearly five feet into the air by 600 men using 6,000 jackscrews. They were so confident in the process that businesses didn't even close during the the five days it took to lift the whole thing.

On the last day of the process, before they began work on the new foundations, they allowed crowds to walk underneath the buildings, among the jacks. At another point, a six-story hotel was raised up without the guests even realizing it.

Only masonry buildings were considered worth raising; they placed wood-framed buildings on large rollers and moved them to the outskirts of town, usually without even bothering to empty out the furniture first.

This was so common that, for quite a few years, people considered looking out the window to see a building going past just another day of normal traffic.