A bad corrosion graphic?

In recently searching for sacrificial images online, I came upon the following graphic (at opentextbc.ca)...

...and I think it has a pretty significant error in representing the science of how sacrificial protection from corrosion works.

I'll put my reasoning after the jump...

Sacrificial anode photos and links

I was recently searching online for some better images of sacrificial anodes for our material science slideshow at school, and I thought I might as well put these out there for any other science teachers using the blog.

I will say in advance that I didn't take any of these, and that's why I'll be linking to the source. All were accessed in January and February of 2020. The links may rot, but I'll keep the images up.

What is an anode rod & how does it work?

I know the answer.

Do you?

If you don't, you might want to check out Landmark Home Warranty's great webpage explaining the usefulness of and science behind hot water heater anode rods.

There's even an infographic in case you don't like so many words.

How It's Made Opalescent Glass (and more Kokomo)

I visited Kokomo Opalescent Glass a few years back, driving to Indianapolis and a half hour north, and paying my five dollars (it's now up to six dollars per person) to take the tour.

I'm pretty darn sure that the above video is from Kokomo's factory, because the videos that Kokomo posted look identical to the one above.






If ever you want to thank your friendly, neighborhood blogger for all the work that he does, might I recommend either a cast or a water jet cut, red Indiana?

Glasschmiede + Galerie Gibacht - Glasgießen

That's just so pretty.

The casting of glass is brilliant and hypnotic and marvelous.

And, when done in that large a scale, it's also dangerous as all heck.

I do wish we got to see the finished, annealed, round disk, however.

How It's Made - Patterned Glass Panels

Yeah, I'm on a glass trend lately. See, I search videos in big bunches and write them up, scheduling them out over weeks and even months. No surprise there, that the videos tend to have themes.

I wouldn't have guessed that there would that much maintenance on the rollers. I just assumed that the molten glass wouldn't have done much damage to the rollers, but I guess it does.

Rolled Table-Cathedral Glass * Tischkathedralglas - Produktion ~ Glashuette Lambers

The video above is wordless, but the description is in German, so narration wouldn't help most of us English-speakers. (My three years of high-school- and one year of college-German were more than two decades ago.)

Die Original Lamberts-Tischkathedralgläser werden in der gleichen hochwertigen Qualität, wie alle Gläser unserer Glashütte, hergestellt. Originalität, Brillanz und Struktur der Tischkathedralgläser sind eben nur mit der Beherrschung dieses handwerklichen traditionellen Verfahrens zu erreichen. Nach der Entnahme der flüssigen Glasmasse aus dem Schmelzhafen wird diese auf spezielle Stahltische aufgegossen und mit einer Walze ausgewalzt. Dabei sind weder Tisch noch Walze strukturgebend. Die typische Oberfläche des Original Lamberts-Tischkathedralglases entsteht einzig und allein aus dem Temperaturgefälle zwischen Glasmasse und Stahltisch und der Konsistenz des Glases selbst.

Luckily, they also provide a translation...

Original Lamberts-Table-Cathedral-Glasses have the same fine quality as all our other products. As a matter of fact originality, brilliance and texture of these glasses can only be achieved by expert craftsmanship deeply rooted in tradition. The molten glass is ladled from the pot, poured onto a special steel table and rolled flat under a cylinder. The structure of the sheet cannot be entirely attributed to the table or the cylinder. The typical surface of Original Lamberts-Table-Cathedral-Glass results from a difference in temperature between the molten glass and the steel table as well as the consistency of the glass itself.

But there is so much fascinating stuff going on here...

• the three-man teamwork to get the heavy ladle full of molten glass
• the fact that the three ladlers use facial and eye protection masks that they hold with their mouths 
• the running of the guy with the ladle on wheels
• the creation of the texture to the glass on a seemingly flat table
• the two glass cutters who clearly have been doing this for decades because they're a well-timed machine
• the fact that the cutters are not wearing any eye protection
• the mustache...seriously, such a glorious push broom

I could watch glass videos all day long...