The siphon, or syphon, is a simple device that uses only a tube to seemingly pump water from a higher spot to a lower one. It's ingenious because once you start the siphon by filling the pipe to below the height of the upper reservoir level, it will continue draining the water, pulling it over the hump and towards the collection below without further help.

Most of us use siphons several times daily, as there are often two at work in the standard toilet. Sometimes there's one in the flush mechanism—one push of the handle to start the siphon drains the water from the reservoir until it runs out. And you can flush a toilet using the second siphon by pouring enough water directly into the bowl to push the water over the bend in the pipe to start it— think how the water drains by itself almost completely before filling up to the level of the bend once again. It's a clever way to power a toilet flush with just the press of a button or turn of a handle. They also minimise leaks and control the flow by running the water uphill.

We set up a greywater siphon to drain water from the bath and showers to a water butt in the garden. To get it started, we connected the end of the hose in the garden to a tap and ran water back up the hose until it shot out the top. Then, dipping it in the water, turning off the tap, and putting the end in the water butt, like magic, the siphon pulls water out of the bath until it's empty.

Surprisingly, a few effects are at work in a siphon, and its mechanism is debated. They can be made to work in a vacuum and even spray liquid upwards with the right setup.

I read that it is from the ancient Greek siphōn meaning a tube or pipe, often for drawing wine from a cask—that would be a decent situation to start the siphon by sucking on the end.

Siphon

Chindogu are inventions that are not really useful but are at the same time, not completely without use. They make sense, but you’d never use them. They are also, as a result, often really funny.

This chindogu article gives some great examples while also sharing the 10 tenets of what makes chindogu, chindogu. Things like: there must be the spirit of anarchy —  they represent freedom of thought and action. And they must exist — just the idea isn’t enough, they must be made.

Apparently, the selfie-stick was invented as chindogu but failed as people evidently actually found it useful — though you can still see why it might have started as chindogu.

Chindogu

Unuseless inventions. Invented by the Japanese. Worth a quick chindogu search.

Chindogu: unuseless inventions

One of the 40 inventive principles. Application not limited to mechanical engineering.

Cheap disposable objects

I love Bill Buxton’s Long Nose of Innovation theory that basically a ton of small incremental work precedes what feels like a wow innovation moment. Computer mice, touchscreens, robotics, CNC machining, haptics etc were all around for decades before they hit the big time.

Sketchplanations tagged with invention