Tag Archives: invention

Polyphony

A bewigged quartet of musicians I drew for my pals at the good ol’ Renaissance & Baroque Society of Pittsburgh some years ago. Did Alcuin have any idea his invention would eventually come to this?

It wasn’t long before musicians figured out they could use notation to write several tunes into the same song: tunes that harmonize with or play against the main tune and enrich it. This is called polyphony.

Alcuin’s invention makes it possible to write fugues and symphonies and operas with parts for an entire orchestra of musical instruments and many human voices. Other cultures nowadays may write and perform symphonies, but they couldn’t do it without Alcuin and Charlemagne and the Holy Roman Empire.

Here are a couple of quick explanations of how musical notation works:
https://www.youtube.com/watch?v=ZN41d7Txcq0
https://www.youtube.com/watch?v=JFaKNR7eeJk
https://en.wikipedia.org/wiki/Polyphony
https://www.theguardian.com/music/2014/dec/17/polyphonic-music-fragment-origins-rewritten
Mediæval music manuscripts are a lovely combination of lettering and notes. https://sites.google.com/a/umich.edu/from-tablet-to-tablet/final-projects/music-in-medieval-manuscripts
https://www.bl.uk/catalogues/illuminatedmanuscripts/ILLUMIN.ASP?Size=mid&IllID=44459
Here are the Mediæval Bæbes to show us what the Middle Ages sounded like—https://www.youtube.com/watch?v=RXrdfTSLWCY
Likewise Carlo Gesualdo (he’s the composer; I can’t find who performed the Tenebrae Responsories for Holy Saturday in this recording)—
https://www.youtube.com/watch?v=YjXQeuO0fLw
You sure can’t beat the Tallis Scholars—
https://www.youtube.com/watch?v=i4VoKso5ERI
Girls could play the game, too. In the 1100s, divinely-inspired Sister Hildegard von Bingen created this music—
https://www.youtube.com/watch?v=0YTOiJ-zjP0
Eventually (ad 1700s—see the sketch above) we got Johanne Sebastian Bach writing stuff like this. I believe the bottom staff has the main tune while the top staff has all the deedle-deedle-deedle (I don’t know how to read music so maybe a musically-literate reader can help me out): https://www.youtube.com/watch?v=gCL5Zvnt0TU
A couple centuries later—you can hear and see the different lines of music played here, in Khachaturian’s gorgeous adagio from Spartacus (this piece brings me to tears every time): https://www.youtube.com/watch?v=wXsDsLHasWo
Here’s what 20th-century New York City sounded like. This is a 1940s Hollywood recreation of the 1924 debut of George Gershwin’s Rhapsody in Blue, but that sure looks like Paul Whiteman at the podium. The piano plays the main tune; the orchestra plays the variations. https://www.youtube.com/watch?v=VAuTouBhN5k

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Alcuin solves the problem

This guy, Alcuin. Not only did he run Charlemagne’s palace school, standardize calligraphy throughout the Holy Roman Empire, invent punctuation (like the question mark), set up the way Latin ought to be pronounced in church—he invented musical notation, too.

It got under Charlemagne’s skin that the Empire’s churches and monasteries sang the same hymns but each church gave a hymn a different tune. Charlemagne was relentless in his campaign to standardize everything. He put Alcuin in charge of making sure every choir sang the same tune. So Alcuin invented musical notation.



Musical notation was meant simply to record the tune of a song. Each note represents a particular pitch, depending on where it sits on a scale. The scale is horizontal lines—it’s a frame of reference. Notes at the top of the scale are sung higher than notes at the bottom of the scale. Thanks to Alcuin, choirs throughout the Empire knew exactly what tune to sing just by looking at the written musical notes.

Here are a couple of quick explanations of how musical notation works:
https://www.youtube.com/watch?v=ZN41d7Txcq0
https://www.youtube.com/watch?v=JFaKNR7eeJk

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The Speedometer

The Speedometer was first patented by German engineer Otto Schulze in 1902.

The Speedometer is one of those dials on the dashboard of a car. It measures miles per hour—distance traveled in a certain amount of time. If you were driving to someplace 50 miles away, you could get there in an hour if you drove 50 miles per hour (mph) the whole way. But there will be town roads as well as the highway, and stop signs and school zones, maybe a potty break. So you won’t be traveling at the same speed the whole trip. The speedometer tells you how fast you’re going right now, whenever you look at it.

Here’s how it works—though I still can’t believe how brilliant this idea is. Remember the drive shaft? The pistons in their cylinders push the driveshaft round and round, so it turns the wheels of the car. I’m going to attach another shaft to the drive shaft. The second shaft works the speedometer. When the driveshaft turns around, this speedometer shaft turns around, too.

At the other end of the speedometer shaft, I attach a magnet inside a metal cup. Both spin on the shaft—but the magnet is attached firmly to the speedometer shaft; the cup isn’t. The cup spins freely.

Imagine now, the speedometer shaft is spinning as fast as the drive shaft. When the drive shaft speeds up, the speedometer shaft speeds up, too. The magnet is spinning around because the speedometer shaft is turning. The metal cup is attracted to the magnet. it spins freely and tries to keep up with the magnet.

The cup can’t keep up with the magnet, though, because I attached a hairspring to it to hold it back. The cup gets tugged by the magnet but it can only move so far. Get this: on the back of the cup, there’s a pointer with a dial behind it. The dial shows numbers, miles per hour. The driveshaft spins around, the speedometer shaft spins around, the magnet spins around, the metal cup tries to spin around—but only moves so far because of the hairspring. It only moves far enough to show on the dial how fast you’re going.

https://www.caigauge.com/blog/the-history-of-the-speedometer
https://itstillruns.com/history-speedometers-8601551.html
https://www.explainthatstuff.com/how-speedometer-works.html
https://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/speedometer.htm

The history of the speedometer and odometer


https://kids.kiddle.co/Speedometer
https://www.speedousa.com/men

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Gravel, tar and steamrollers!

I tried, but couldn’t draw a tarmacadam picture half as wild as this one from an old French postcard of road-builders on le Champs-Élysées.

In Scotland, John Loudon McAdam designed roads made of layers of crushed stone, which are then steamrolled. Edgar Hooley improved McAdam’s process by covering the gravel with hot tar. The tar kept the gravel from forming wheel-ruts, and protected rubber tires from the sharp-edged stones. This whole shebang is called the tarmacadam (tarmac) process. Streets in Paris, France were the first to get paved this way. By the late 1800s the United States began paving tarmacadam roads. Driving a Model T would be less bumpy—and safer.

 

https://www.merriam-webster.com/dictionary/tarmacadam

What’s the Difference Between Tarmac and Asphalt?



https://www.magzter.com/article/Education/How-It-Works/The-History-Of-Tarmacadam

http://www.bbc.co.uk/nottingham/content/articles/2009/07/03/edgar_hooley_tarmac_feature.shtml

Here’s what a steam roller looked like—

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More cars, please

The Tin Lizzie

Henry Ford figured out how to produce gas-powered cars quickly and inexpensively.

First, he used standardized, interchangeable parts. The passenger door for one Model T automobile will fit on any other Model T. Same with the axles, wheel rims, door handles, pistons, cylinders, cup-holders, nuts, bolts—nothing on the car needed to be specially-made.

Second, Ford introduced a moving assembly line. Instead of his builders moving from car to car, cars moved from crew to crew, pulled by a chain down the line. Each crew had a specific task, like putting the doors on, attaching the wheels, installing the engine, or painting the body. That might get repetitive but—they could build a whole car in an hour and a half.

Can you imagine that? Cars were shooting out of that factory so quickly that Ford could charge a low price for them and still make a profit. The steam cars were expensive because they were more or less custom-made. So people bought gas-powered Model T Fords.

https://www.thoughtco.com/henry-ford-and-the-assembly-line-1779201
https://www.history.com/topics/inventions/henry-ford
https://www.thehenryford.org/collections-and-research/digital-collections/expert-sets/7139/
https://www.pbs.org/video/american-experience-ford-assembly-line/

https://auto.howstuffworks.com/1908-1927-ford-model-t.htm

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Swimming upstream

By now I’m sure you’ve spotted the pattern: there’s a situation where people struggle to get from Point A to Point B, and some tinkerer comes along and says, “I bet I could make those people’s lives easier.” We saw how Watt’s steam engine turned a wheel to pump water out of a mine. Trevithick developed that idea into a steam locomotive to haul carts of coal. Stephenson improved the locomotive to move cars full of people along rails made of Bessemer steel.

In Great Britain and the United States, inventors worked on the problem of moving a vessel in water. Just like a locomotive, a steam engine would pump a piston to turn a wheel. This time the wheel had paddles and was mounted on either the stern or the sides of a boat.

John Fitch proposed a design with banks of oars, like an Indian war canoe.

John Fitch and James Rumsey designed steam-powered boats that operated on the Delaware River between Philadelphia and New Jersey. In Scotland, William Symington designed a boat for towing on the Forth and Clyde Canal. In 1801 his steamboat the Charlotte Dundas ran successfully upstream on the Carron River. The Mississippi is a big river with a powerful current. It would take a powerful engine to move a boat against it.

https://www.britannica.com/biography/John-Fitch

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Hot and steamy!

George Stephenson is another one of those tinkerers whose genius is improving an existing invention. Like Trevithick, he worked in a coal mine. Stephenson took the steam locomotive to its next level, making it more powerful.

The basic principle of a steam engine is: fire heats water in a boiler; the water turns to steam; the steam expands and creates pressure; the steam escapes into a cylinder to push a piston. The cylinder has 2 openings to let in steam so that the piston is pushed back and forth as steam fills one side and then the other. The piston is attached to a wheel, so the piston’s back-and-forth motion is changed into circular motion.

How to improve that? One way was to run copper pipes from the fire through the boiler so water gets hotter. Then you could mix the smoke from those pipes with the steam exhaust (from the cylinder) in a smoke box. The super-hot smoke and steam want to quickly escape up through a blast pipe (chimney). That in turn pulls more air into the firebox and makes the fire burn hotter. That means more steam, more pressure—so the piston moves faster with more power.

Stephenson designed the cylinders/pistons closer to horizontal, so they lost less energy. He also attached them directly to the driving wheels. Trevithick’s design had pistons that turned great gears that turned the driving wheels. It transferred energy from a piston to a gear to another gear, losing a little energy with each step. Remember how concerned Harrison was with friction between moving parts of a clock?

https://www.historytoday.com/archive/george-stephensons-first-steam-locomotive
http://www.bbc.co.uk/history/interactive/animations/rocket/index_embed.shtml


https://en.wikipedia.org/wiki/Stephenson%27s_Rocket

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The Age of Steam

Over-simplified drawing of a steam engine. The fire heats the water; water turns into steam, steam expands and enters the chamber; steam forces the piston into the other chamber; piston pushes the beam; beam turns the wheel. The wheel pushes the switch that shuts off first chamber so steam enters the second chamber; piston moves down.

As sailing ships were being designed bigger, speedier and lovelier—two or three tinkerers were fooling around with a way to get water out of coal mines.

Mines are dug to extract valuable minerals. Sometimes the digging will open up a spring and water flows in, flooding the mine. Horses or men worked pumps to empty the mines, but animals and people tire out easily. In 1698 Thomas Savery invented a steam pump to get water out of mines. His invention had limitations (it didn’t work if the mine were too deep) and it had an unhappy tendency to explode.

In 1712, Thomas Newcomen invented a steam engine that moved a heavy beam which worked a pump. It had limitations as well—his engine needed constantly to be fussed with to keep it cool or hot, which made it inefficient. In other words, it needed lots of energy to make it put out energy.

In 1765, James Watt made some big design changes to Newcomen’s engine which made it efficient. It had a piston which could work a pump by turning a wheel.

https://www.livescience.com/44186-who-invented-the-steam-engine.html Elizabeth Palermo
https://www.livescience.com/2612-steam-engine-changed-world.html Heather Whipps
https://www.thomasnet.com/articles/custom-manufacturing-fabricating/steam-engine-history/