Mechanical calculator Hamann 300 divides 1 by 3

The 1954 machine Hamann 300 (so called version A) - semi automatic " ratchet" calculator. Machines like this one used coupling angle between rotating shaft and double sided gear to encode numbers being bit faster and less noisy comparing to pin wheel designs.

[@iusearchbtw4969]

That one quite kid with his unhackable computer:

[@wizrom3046]

Back when pocket calculators were HEAVY

[@shreddedOrphans]

Computers used to be mechanical like this. Nowadays computers have CPU's with billions of transistors. But a long time ago they used relays instead. Which means computers used to click like this too.

[@shenghe9876]

What happens if you divide 0 by 0?

[@petergarbutt9521]

WHO EVER IS TAPPING IN THE EXAM ROOM, STOP, THIS IS YOUR ONLY WARNING

[@PJB-ks9vn]

It’s like a cross between a typewriter and a calculator! Such an interesting contraption indeed!

[@acidwarrior2]

blessed by the algorythm once gain

[@ChristiRich]

My grandmother did bookkeeping for our family business on a mechanical adding machine. I used to love the way that it sounded.

[@davidwitte8469]

Now divide by 0.

[@Elriuhilu]

This is the coolest thing. I find this more impressive than an electronic computer somehow, because a computer functions by forcing electrons through an abstract obstacle course, whereas this thing is a machine with cogs and stuff that you can comprehend just by looking at it as it functions and then it does something that seems to transcend what a bunch of spinning metal should be able to achieve. This thing is literally a car transmission box, except instead of just making a second thing spin around it does mathematics.

[@pwnmeisterage]

Cast iron and milled steel. Solid and built to last. The thing probably weighs about 15kg (35lbs).

[@varoonnone7159]

The level of ingenuity to build such a thing

[@markrice41]

My dad had a Frieden when I was little. It had a roll around stand. It would make noise like that and the stand would rock back and forth.

[@calm2584]

the amount of logic and thought that went inside this is insane

[@phlogistanjones2722]

The shortcoming initially is that one must be taught the programming steps.

[@averyzaliasylvia4026]

Imagine how genius you must be to create things like that

[@shappar5039]

0:18

[@vaclavtrpisovsky]

Oh yes, division: １＋３Ｉ←←

[@wayando]

The guys that built these things were serious engineers.

[@Avaruusmurkku]

Such fine workmanship and engineering for absolutely glacial calculation speed. Computers and silicon have spoiled us.