Recent comments in /f/gifs

FlyingWeagle t1_j3jwo05 wrote

Reply to comment by ruiner32 in How keys works. by -birdbirdbird-

The one thing he doesn't mention is that you use the turning tool to apply pressure throughout the pick. Turning the cylinder traps the pins against their housing. They're all slightly different thicknesses, which is why different pins are binding at different times.

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Scoobz1961 t1_j3jvgqv wrote

Reply to comment by beebs44 in How keys works. by -birdbirdbird-

Not sure if people explained the main principle properly. The key position every pin at the same time into the correct position to allow the lock to open. If all the pins were perfectly made there wouldnt be other ways to unlock it.

But they arent. They wont be. They cant be. And you can use this to position each of the pins into correct position one at a time. This is why you have the turning tool that you apply pressure to to make the pins press into the sides of their holes. At any given moment, due to the imperfection, only one will be pressed against the walls completely.

Once you position that first pin, the lock will turn ever so slightly and another pin will now be the one that is pressed. Do that for all pins and the lock will eventually turn open. All that is left is to find the correct order of pins being pressed into the side of the cylinder.

The pin that is pressed is the one that is "binding". When there is "nothing" on a pin, it means its not being pressed at all. When pin that was binding "clicks" it means it has been set into the right position, which made the cylinder rotate and now a new pin is "binding".

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SookHe t1_j3jvg5v wrote

Reply to comment by qawsedrf12 in 10,000 Dominoes gone in seconds by The_Gus_Destroyer

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Looks like this is what you will have to deal with.

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old_gold_mountain OP t1_j3jsdem wrote

Reply to Western terminus of the Transcontinental Railroad, 100 years ago vs. today by old_gold_mountain

This is from a little snippet of a YouTube documentary I made about the history of ferryboats on the San Francisco Bay:

https://www.youtube.com/watch?v=duKJ8eNFklI&t=95s

The Western Pacific terminal was one of several railroad terminals that different companies used on the West end of the Transcontinental Railroad. Today, two of them remain as they did originally: This one, which is now offices, and the 16th Street station, which sits abandoned today: https://en.wikipedia.org/wiki/16th_Street_station_%28Oakland%29

Most travelers on the transcontinental railroad who were headed into San Francisco used ferryboats to finish their trip, as there was no rail crossing at the time connecting the rail line directly into San Francisco. The railroads operated their own large passenger and vehicle ferries (kind of like what they have in Seattle today). And the transfer stations were pretty huge and impressive:

https://en.wikipedia.org/wiki/Oakland_Long_Wharf

Today, there is only one subway line connecting the East Bay to San Francisco, and San Francisco still has no Amtrak station. Passengers still have to transfer in the East Bay, but they can either transfer to BART at Richmond or connect to an Amtrak thruway bus at Emeryville to cross the bridge.

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