Skip to main content

Scaffoldings

I received the Tish Murtha book, “Elswick Kids” a few days ago. In the book is an introduction by Mark Richards, and further along, a picture of several kids climbing up the scaffolding of a building. The scaffolding picture is ebullient. The kids are having a blast; a group of six or so of them are at various stages in their climb up the side of the building having levered boards down in a few places to more easily scale the thing. 

Meanwhile, the book’s introduction laments,

To those of us who lived through this time the images will look strangely familiar - like a mirror of our own existence for we children who were lucky enough to be born free.

and I’ve got to say, in some ways I think kids are still born free, can still play like the kids in this book, but in other ways.. Well, it made me think of our own scaffolding experience a few weeks ago.

Plugging away at my standing desk in front of the Old Fed Reserve, I noticed the kid’s feet were no longer on the ground. She’d launched herself up the scaffolding in front of us. (Just like the kids in the picture I wouldn’t see for a few weeks yet.)

“Umm… get back off of there please.”

Climbing down, the kid said, “Why?”

“Well, mostly ‘cause I’m here. And, since I’m here, I realize I have no idea how well the scaffolding is attached to the building, or whether it’s really setup to handle you climbing.  Also, I could get arrested for you climbing since I’m here, and that’d suck for both of us.”

“Ahhh… That’s stupid, but OK.

That’s the kid’s response to lots of things lately, and frankly, she’s not wrong. If I wasn’t there, and we lived in a  fairly reasonable world, at worst someone would shoo her down, maybe give her a strong talking to, and send her away to—anywhere really—as it wouldn’t really be their problem.

Alas, that’s not the world we live in now, and I suppose that’s the point the intro to the Tish Murtha book was trying to make. But, fundamentally, have kids changed? Apparently not. Given the chance, they still leap right up the scaffolding.


Comments

Popular posts from this blog

Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...

The Valentine's Day Magnetic Monopole

There's an assymetry to the form of the two Maxwell's equations shown in picture 1.  While the divergence of the electric field is proportional to the electric charge density at a given point, the divergence of the magnetic field is equal to zero.  This is typically explained in the following way.  While we know that electrons, the fundamental electric charge carriers exist, evidence seems to indicate that magnetic monopoles, the particles that would carry magnetic 'charge', either don't exist, or, the energies required to create them are so high that they are exceedingly rare.  That doesn't stop us from looking for them though! Keeping with the theme of Fairbank[1] and his academic progeny over the semester break, today's post is about the discovery of a magnetic monopole candidate event by one of the Fairbank's graduate students, Blas Cabrera[2].  Cabrera was utilizing a loop type of magnetic monopole detector.  Its operation is in...

The Alcubierre Warp Drive Tophat Function and Open Science with Sage

I transferred yesterday's Mathematica file with the Alcubierre warp drive[2] line element and space curvature calculations to the  +Sage Mathematical Software System  today, (the files been  added to the public repository [3]).  If you haven't used Sage before, it's a Python based software package that's similar in functionality to Mathematica.  Oh, and it' free.  I also worked a little more on understanding the theory, but frankly, I made far more progress with the software than the theory.  What follows will be a little more of the Alcubierre theory, plus, a cool Sage interactive demo of one of the Alcubierre functions[1], as well as a bit about my first experience with using Sage. Theory The theory is fun, but it's moving slowly.  Here's the chalk board from this morning's discussion Alcubierre setup the derivation using something called the 3+1 formalism which means we consider space to be flat, (in this case), slices that are labelled ...