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getty images

5 Delightful Science Experiments From 100 Years Ago

getty images
getty images

In 1892, the dubiously named Mr. Tom Tit published a book of at-home activities for children called Magical Experiments: or, Science in Play. He made sure each scientific exploration could double as a parlor trick; something exciting and strange to impress as well as instruct.

Some of his experiments are all but impossible to do today (even if you can find spermaceti candles, you really shouldn't use them), and some of his once common ingredients haven't been available at drug stores for decades. But that doesn't mean you can't do them. If the product still exists, you can find it online. This accessibility re-opens a whole forgotten world of fantastic science fun, one that leaves the tired vinegar and baking soda volcanoes looking hollow.

1. Bottle cannon

You'll need: Empty champagne or wine bottle with cork, baking soda, tartaric acid, a notecard rolled into a tube, thread, wadded paper, two pencils, and thumbtack.

The trick: The original text phrases it better than I ever could:

Would you like to imitate at table the explosion of cannon, listen to the thunder that frightens nervous people, and even observe the actual recoil of your artillery? You may safely answer, "Yes;" for the experiment I now propose is a quite harmless one, as you shall see.

Fill the bottle a third full of water and dissolve "a certain quantity" of baking soda into it. (My guess is, the more soda the bigger the bang, so you may want to start small). Pour the tartaric acid into the rolled up note card (again, amounts aren't specified, so best start small) and plug it with pellets of wadded paper. Tie the roll with a thread that you then pin to the underside of the cork with the thumbtack. Replace the cork. The roll shouldn't touch the water until you've laid the bottle on its side, on top of the pencils. Then, the paper will dissolve, the tartaric acid will meet the baking soda, and BOOM, your bottle blasts forth its cork missile and rolls back upon its gun-carriage (pencils), just like a real cannon.

The science: Baking soda is a base, tartaric acid is, of course, an acid. When the two combine, carbon dioxide gas is quickly created. This gas is much less dense than the powders it came from, and needs more room. Blasting the cork out of the bottle is one of the ways it makes that room.

2. Wet coin, dry hand

You'll need: Bucket or pot of water, small object that will sink, and lycopodium powder.

The trick: First, stomp out anything flammable within a 10-foot radius. Then, submerge any little object, like a ring or coin, in your pot of water. Next, apply a liberal puff of your "magic powder" to the surface of the water. Finally, reach your hand into the water and retrieve the object. When you pull your hand out, the object will be wet, but your hand, even though your audience saw you soak it in a bucket of water, will be completely dry. Huzzah!

The science: It's the miracle of a fat little clubmoss called Lycopodium. I say fat because the spores of this plant, when dried, have an amazingly high fat content. The resulting powder is highly flammable but quickly burns out, which is why it is popular as a flash powder for magicians (and often sold under the name "Dragon's Breath"). But more importantly, all that fat hates water. When you reach slowly through the powder, it forms a waterproof glove around your hand, repelling water molecules and allowing you to stay dry in the process.

3. The punishment of tantalus

You'll need: A strong chair and a small treat, someone strong to "spot" Tantalus.

The trick: Thirsty Tantalus was cursed forever to reach for a pool of water that dried up as soon as his hands came near. Here Tantalus just has to pick a taffy up only using his mouth, while not falling off a dining room chair that's been placed on its front legs. Unless Tantalus figures out how to maintain his center of balance, the chair will begin to tip (hopefully into the arms or sofa cushions waiting to catch such an unbalanced snacker).

The science: There is no more fun way to learn about physics than through candy and improper use of mother's good chairs. In this experiment, we use those tactics to explore center of mass. You and the chair each have your own, but you're also sharing one. When you put weight toward the candy, you defy your joint center of balance and the chair responds to the insult by throwing you off. However, if you crouch low (the lower the center of mass, the easier it is to balance) and give as much weight as possible to the heavier end of the chair, you can maintain your center of gravity and retrieve the candy.

4. Magic salad dressing

You'll need: Oil and vinegar, a sealable clear container, and a dinner party

The trick: This experiment is described in the form of a story about a "jolly company" on a picnic together. This company is distraught to see that the man responsible for bringing the oil and vinegar salad dressing saved himself the trouble of carrying two bottles by mixing them together. Not everyone likes the same proportions of oil and vinegar on their salads, after all. So they are astonished when the young men walks around the picnic, distributing both the oil and vinegar, from the same bottle, in the exact proportions requested by each diner. How does he manage it?

The science: We know that a lot of liquids mixed with oil immediately separate. This is because the lipids in oil don't like water molecules, but they love their fellow fat molecules. Vinegar is mostly water, so the two liquids naturally separate when allowed to settle. The oil floats to the top of a bottle and is easily poured out. When the vessel is slowly turned upside down, both components stay put, so the vinegar is now right near the mouth. So, for oil, just tilt the bottle and pour very slowly. For the vinegar, turn the bottle upside down and open the mouth just a little.

5. Automatic drinking fountain for pets

You'll need: A bottle (plastic is fine) that you can affix upside down to or against a wall (it must be removable). A shallow pan and water.

The trick: Technically this device was meant to water barnyard fowl, but it should work just as well for any small animal. The device isn't so much a trick as it is a clever solution to what must have been a common problem: disgusting water-troughs for outdoor animals. The bottle is set up so that the mouth does not quite touch the bottom of the pan, but goes halfway below the brim. The pan will fill with water, but only to the level of the water inside the up-turned bottle mouth. Every time a significant amount of water is drunk, or even evaporated, fresh water comes forth to replace it.

The science: Atmospheric pressure! Water is only able to flow out of the bottle because the bottle is simultaneously sucking in air, trying to match the air pressure of the air outside. But once the water level of the pan rises to the same level as the water in the upturned bottle, the mouth of the bottle is sealed. No more air can enter the bottle to displace the water. At least not until enough water is drunk.

All images courtesy Google Books: Magical Experiments: Or, Science in Play**

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Watch Apollo 11 Launch
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Vice President Spiro Agnew and former President Lyndon Johnson view the liftoff of Apollo 11
NASA, Getty Images

Apollo 11 launched on July 16, 1969, on its way to the moon. In the video below, Mark Gray shows slow-motion footage of the launch (a Saturn V rocket) and explains in glorious detail what's going on from a technical perspective—the launch is very complex, and lots of stuff has to happen just right in order to get a safe launch. The video is mesmerizing, the narration is informative. Prepare to geek out about rockets! (Did you know the hold-down arms actually catch on fire after the rocket lifts off?)

Apollo 11 Saturn V Launch (HD) Camera E-8 from Spacecraft Films on Vimeo.

Romano D’Agostini, Giorgio Cargnel, Soprintendenza Speciale di Roma
Utility Workers May Have Found One of Rome’s First Churches
Romano D’Agostini, Giorgio Cargnel, Soprintendenza Speciale di Roma
Romano D’Agostini, Giorgio Cargnel, Soprintendenza Speciale di Roma

The remains of what may have been one of Rome’s earliest Christian churches were accidentally discovered along the Tiber River during construction, The Local reports. The four-room structure, which could have been built as early as the 1st century CE, was unearthed by electrical technicians who were laying cables along the Ponte Milvio.

The newly discovered structure next to the river
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No one is sure what to make of this “archaeological enigma shrouded in mystery,” in the words of Rome’s Archaeological Superintendency. Although there’s no definitive theory as of yet, experts have a few ideas.

The use of colorful African marble for the floors and walls has led archaeologists to believe that the building probably served a prestigious—or perhaps holy—function as the villa of a noble family or as a Christian place of worship. Its proximity to an early cemetery spawned the latter theory, since it's common for churches to have mausoleums attached to them. Several tombs were found in that cemetery, including one containing the intact skeleton of a Roman man.

Marble flooring
Romano D’Agostini, Giorgio Cargnel, Soprintendenza Speciale di Roma

A tomb
Romano D’Agostini, Giorgio Cargnel, Soprintendenza Speciale di Roma1

The walls are made of brick, and the red, green, and beige marble had been imported from Sparta (Greece), Egypt, and present-day Tunisia, The Telegraph reports.

As The Local points out, it’s not all that unusual in Rome for archaeological discoveries to be made by unsuspecting people going about their day. Rome’s oldest aqueduct was found by Metro workers, and an ancient bath house and tombs were found during construction on a new church.

[h/t The Local]


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