Automated Doors
Automated door technology appeared in 1931 and was considered one of the signs of the “modern” age. Yet, the world had already seen this technology back in 1 AD. So how did it work? If you wanted to open the door, a fire would need to be lit to generate heat, causing an atmospheric build-up in brass vessels. This vessel would then pump water in holding containers, and these functions would act as weights to open the door. Think of it as a hydraulic system. Unfortunately, the doors were not that practical and not as popular as the modern doors you have around your city. The ancient doors took hours to open, and the process was hard to stop once it started. So, this probably meant that you only opened your doors once a day.
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Valentina 10 month s ago
#40 Early SONAR maybe but not RADAR.
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Frederick 10 month s ago
Valentina,
When there is drama in the Café. My Wife goes like this.
When there is drama in the Café. My Wife goes like this.
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Derrick 10 month s ago
#21 man I don't know what kind of cars have you had since but practically all cars have that option for the past twenty years.
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Beedy 10 month s ago
Derrick,
twenty, not thirty-five.
twenty, not thirty-five.
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Dacey 10 month s ago
#12 Can anyone date this photograph?
Thanks in advance!
Thanks in advance!
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Beedy 10 month s ago
Dacey,
it's a handsome photograph, I'll give it that, but for now I'd rather date women, thanks.
it's a handsome photograph, I'll give it that, but for now I'd rather date women, thanks.
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Dotty 10 month s ago
#9 Tesla fanboys will believe anything. That idea of electricity through the air is dangerous and so busted. 
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Gerrie 10 month s ago
Quote: Dotty
Chatty Cathy
You're assuming that all frequencies of microwave radiation are dangerous. Tesla lived to a 86 years, despite his exposure to it. Cell phone towers use microwave frequencies.
When there is drama in the Café. My Wife goes like this.
twenty, not thirty-five.
Thanks in advance!
it's a handsome photograph, I'll give it that, but for now I'd rather date women, thanks.
You're assuming that all frequencies of microwave radiation are dangerous. Tesla lived to a 86 years, despite his exposure to it. Cell phone towers use microwave frequencies.