ChatGPT prototyping large html img downloads

Last week, I asked ChatGPT to create header maps per QSO from a CZML map of my POTA outing. It dumped out code that I had to fuss a little bit with, but that did the job admirably.

The output is text-encode png images in the console of the Cesium Sandcastle window. I would then download those images by copying them into an html file, opening the html file in a browser, and downloading each of the images individually. That was cool, until...

Last night, I made 51 QSOs at US-4571 in San Francisco. That's a lot of files to download individually, so I asked ChatGPT:

Please write a JavaScript, do not use React, that can save all the images from web page locally.

It responded with code that downloaded the first 10 images. I asked it for a fix

That only downloaded the first ten. Please modify the code so that it downloads all the imags and uses .png as the default extension.

and it produced a modified version of the code that handily downloaded all 50. See the demo below. You can see the differences in the code produced in this gist.

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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 ...

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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...

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