Engineering logic

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AES

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Someone sent me this today. Whilst perhaps not completely historically accurate I thought it amusing enough to share.

Here goes:

Is this appropriate to the times in which we live??

This is all you need to know to become a REAL Engineer. (You'll probably love the logic here).

The U.S. Standard railroad gauge (distance between the rails) is 4 feet, 8.5 inches. That's an exceedingly odd number. Why was that gauge used?

Because that's the way they built them in England , and English expatriates designed the U.S. Railroads.

Why did the English build them like that?

Because the first rail lines were built by the same people who built the pre-railroad tramways, and that's the gauge they used.

Why did 'they' use that gauge then?

Because the people who built the tramways used the same jigs and tools that they had used for building wagons, which used that wheel spacing.

Why did the wagons have that particularly odd wheel spacing then?

Well, if they tried to use any other spacing, the wagon wheels would break on some of the old, long distance roads in England , because that's the spacing of the wheel ruts.

So, who built those old rutted roads?

Imperial Rome built the first long distance roads in Europe (including England) for their legions. Those roads have been used ever since. And the ruts in the roads?

Roman war chariots formed the initial ruts, which everyone else had to match for fear of destroying their own wagon wheels.

Since the chariots were made for Imperial Rome , they were all alike in the matter of wheel spacing. Therefore, the United States standard railroad gauge of 4 feet, 8.5 inches is derived from the original specifications for an Imperial Roman war chariot.

In other words, bureaucracies live forever.

SO ….

The next time you are handed a specification, procedure, or process, and wonder 'What horse's pineapple came up with this?', you may be exactly right. Imperial Roman army chariots were made just wide enough to accommodate the rear ends of two war horses.

BUT ……. (to bring this logic more or less up to date) …..

When you see the Space Shuttle sitting on its launch pad you’ll notice that there are two big booster rockets attached to the sides of the main fuel tank. These are solid rocket boosters, or SRBs.

The SRBs are made by Thiokol at their factory in Utah.

The engineers who designed the SRBs would have preferred to make them a bit wider but the SRBs had to be shipped by train from the factory in Utah to the launch site in Florida. The railroad line from the factory happens to run through a tunnel in the Rocky Mountains and of course the SRBs had to fit through that tunnel.

The tunnel is slightly wider than the railroad track, and the railroad track, as you now know, it’s about as wide as two horses' behinds.

So, a major design feature of what is arguably the world's most advanced transportation system, the Space Shuttle, was determined over two thousand years ago by the width of a horse's pineapple.

And you thought that being a horse's pineapple wasn't important!

So now you know - horses' pineapples control just about everything!

Explains a whole lot of stuff, doesn't it?

;-)

AES
 
katellwood":1ex1kwif said:
They should have stuck with Brunel and made it 7' 1/4"
Yes but a lot of railways were still partly horse drawn until surprisingly late - 1950s around here on bits of the Cromford & High Peak RW.
So where did Brunel get his 7' 1/4" from, and why the 1/4" ?

PS George Sturt mentions the wheel gauge standard. I don't know if it goes back to the Romans (quite possible) but it certainly goes back a long way. Wrong gauge and your wheels don't fit the ruts.
Other standards relate to farming/animals/humans too - rod/pole/perch/inch/foot/yard etc. In fact all(?) old measurements are related to human activity in one way or another. This is good engineering. Imposing an arbitrary metric system has drawbacks - doesn't even suit navigation, where variable nautical miles are much more use.
 
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