Most complicated thingy

[Rduke55]

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The brain. Though strictly speaking, these are made by women only.

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Some of the blueprints are from the man though.

[Rduke55]

What about that ancient greek computer thingy?

[FlFishOn]

Palomar telescope mirror mechanical computers:

""Active" mirror control: To combat flexure, Bruce Rule devised 36 devices which are plugged into voids on back of mirror (can be seen through holes in mirror cell). Each of these mechanical computers has 600-1000 parts (number depends on whether or not you count all parts of a bearing race individually, etc.), and can apply up to 1200 pounds of force to mirror. No living person fully understands these devices."

This is Cal Tech we're talking about here. Nobody understands them? That's f-ing complex. No power source save channeling gravity runs them. This is WWII era engineering.

The Norden bomb sight was pretty damn complex but likely has some electrical gyros, I dunno for sure.

[OneForTheMel]

This is on the border of qualifying/not-qualifying because it creates electricity, but doesn't use it (or maybe I'm totally wrong, it was the first thing that came to my head, I really xon't know anything about the subject). The hydro-electric dam, it puts out a great deal of eletrical energy from the natural kinetic energy of the waters running through it. It's truly an amazing structure in both construction and use.

[billygrippo]

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This is on the border of qualifying/not-qualifying because it creates electricity, but doesn't use it (or maybe I'm totally wrong, it was the first thing that came to my head, I really xon't know anything about the subject). The hydro-electric dam, it puts out a great deal of eletrical energy from the natural kinetic energy of the waters running through it. It's truly an amazing structure in both construction and use.

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the principle of the hydro-electric damn is actually quite simple.

[AceofSpades]

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This is on the border of qualifying/not-qualifying because it creates electricity, but doesn't use it (or maybe I'm totally wrong, it was the first thing that came to my head, I really xon't know anything about the subject). The hydro-electric dam, it puts out a great deal of eletrical energy from the natural kinetic energy of the waters running through it. It's truly an amazing structure in both construction and use.

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I wouldn't say it's really that complex though, although quite amazing. My vote is for that mirror thingy.

[mostsmooth]

does that old dude that created that coral courtyard stuff count? he made a revolving door from a huge piece of coral that cranes were having trouble lifting. wait, was it coral or granite? maybe it was granite.

[John Cole]

From Babbage's original design .

[John Cole]

Oops; posted in the wrong place. See above for the engine that was built.

[P Chippa]