Questions tagged [machines]
8 questions
36
votes
1 answer
Does rubbing a rejected coin against the ticket machine make it likelier to be accepted?
When a rapid transit ticket machine in Germany refuses to accept a coin, I've often seen the ticket-buyer scratch the same coin on the machine's metal surface before re-trying it. Some scratch with the coin's edge, some with a flat face.
It doesn't…
Anko - inactive in protest
- 1,991
- 2
- 18
- 29
11
votes
2 answers
Do air-conditioners need a 3 minute break after being started or stopped?
I have always been told that one should wait (at least) 3 minutes after turning on an air-conditioner before turning it off, and wait 3 minutes after turning off an air-conditioner before turning it back on. I have also heard that not doing so…
yydl
- 825
- 2
- 8
- 14
11
votes
1 answer
Was a 5000 year old flying machine discovered in Afghanistan?
If you search on Google "5000 year old flying machine discovery", there are lot of article and YouTube videos available claiming 5000 year old flying machine called "Vimana" discovered in Afghanistan. When US soldiers try to remove the flying…
Madhu
- 518
- 1
- 6
- 12
7
votes
0 answers
Have refrigerators become less reliable over time?
An often recited quip, both in my home and in popular culture, is "They don't make them like they used to." Most recently, the quote was brought up when our refrigerator stopped dispensing filtered water.
Is there data to back up the claim that…
Mark Miller
- 170
- 5
6
votes
2 answers
Was Hoysaleswara Temple built with lathes?
I saw this very popular video a few days ago: Hoysaleswara Temple, India - Built with Ancient Machining Technology?
Here is a related article.
It claims the following
If you look closely, you can see these minute circular marks all
around the…
user13107
- 813
- 2
- 9
- 11
4
votes
1 answer
Time traveling machine invented?
Yesterday a news report said that an Iranian scientist claims to have invented a 'time machine' that will allow one to 'travel' up to 8 years into the future to predict with 98% accuracy the future for any individual.
Does this machine truly work?…
Popopo
- 301
- 2
- 7
3
votes
1 answer
How powerful are air cannons?
I wondered how powerful air blasters are.
Is it possible for one to be so powerful that the shock wave passes through walls, floors and ceilings? Could it make bumps on metallic surfaces or at least an audible noise, like a pebble falling on it?
The…
Raskolnikov
- 155
- 6
2
votes
3 answers
Can a 3D scanner work as shown in this youtube video?
3d printers look pretty awesome, but I can't help but think that this youtube clip was a little doctored. Not because of the printer, but because of the scanner.
Can they really figure out the mechanics of a crescent wrench that quickly with their…
Peter Turner
- 1,187
- 6
- 27