Here’s any easy method for backing out the combination of a Master Lock. In a perfect world there would be 64,000 possible lock combinations (40³). The construction of the lock prevents this from happening: sloppiness in the dial and the numbers are not mathematically independent. First step is to determine the last number in the sequence. You can then use that number to determine the other possible numbers in the combination. You will end up with about 100 combinations to try, but that’s far better than having to throw the lock out which I’m sure would happen if you had to try 64,000.

UPDATE: x04d sent in a video demo (DivX) (dead link) of how to open a lock in 2 sec. using a padlock shim.

UPDATE: The linked video above has long been dead. Check out our more recent Master lock post for an embedded shimming video

Continue reading “Master Lock “picking”” →

This looks like a pretty cool toy to build. At the top of the cylinder is a fan that removes air from the center column of the device creating a low pressure zone. This air is then blown back into the cylinder to feed the rotation. Besides the regular construction supplies you’ll need a squirrel cage fan and speed control. The most expensive part of this project is the mist generator. The nice thing is, you can construct the entire device and make sure it’s functioning before you dump money into the mister. I saw a really large one of these last year at NCAR in Boulder, CO. It was pretty cool, but naturally I was there to see the Cray-1A [via]. Lately we’ve been creating our own path of destruction so we’re hosting the pdf which was originally found at weather-photography.com.

[thanks seesoe]

Continue reading “Build Your Own Tornado Machine” →

Here’s something cool and refreshing just in time for the weekend and that wild Flag Day celebration you were planning. This is similar to the margarita machine that was circulating last month. They’re both based on garbage disposals. fixer’s design uses an external return pipe. It also uses a 4-gallon stock pot instead of the giant plastic drink cooler. I’m guessing this made attaching the garbage disposal a lot easier. Mentally you still have to overcome the fact that you’re drinking out of something that was originally intended to process waste, and a plastic drain pipe coming out of a chip board box isn’t going to make that any easier to stomach. He says it works great, but the lack of insulation probably means that it doesn’t stay frozen very long. It would be cool if I could turn that dewar we had back on the farm into one of these, wait

That title is really misleading; this hack doesn’t require a lava lamp… anymore. I initially went googling for a 1996 project at SGI that generated random numbers by taking photos of a lava lamp. The lava lamp was chosen because of its chaotic nature. I was suprised to find that SGI had patented/trademarked the lavarand^tm technology. The system required you to use IRIX, took up a lot of space, and because of patents wasn’t easy to implement. In 2000 the engineers behind the original decided to develop an open source alternative know as LavaRnd (note the capital “L” and “R” ;-). This iteration doesn’t use a lava lamp. Its source of chaos is camera with the lens cap on. The gain on the CMOS sensor is cranked all the way up to create a really noisy image. The image data is then sent through an algorithm to generate the random numbers. If you want to see the original project you’re going to have to ask the Wayback Machine.

Continue reading “Lava Lamp Random Number Generator” →

Here is a little something for your Memorial Day. My mouth began to water when this link first showed up. I clicked it and then

I’ve wondered about the crazy image URLs Amazon uses before, but not more than a few seconds. It seems a Peanuts fan decided to get to the bottom of it. Nat Gertler has deciphered the meanings  of most of the values that show up in Amazon URLs. It’s really simple to try out. Just pick out an image URL and start dropping in options: You can change the value and color of the percentage off bullet. Rotate the image to an arbitrary angle. Add “search inside” and “look inside” banners wherever you want. You can even view the original cover the book was submitted with.  Many of these options can be doubled up too. I can’t really think of what the “killer app” for this is, but it is fun to see the mechanisms behind web applications that have to serve thousands of people.

[via boingboing]

Continue reading “Abusing Amazon’s Dynamic Image Generator” →

Power over ethernet lets you add a DC voltage source to the unused pairs in your ethernet cable. This power can be used to power devices that are poe compatible by just plugging the cable into them. Other devices can be powered by using a “tap” to break the DC pairs back out of the cable. POE is a good choice for powering devices in remote locations. A router can be placed on a roof right next to its high-gain antenna, reducing signal loss, without having to run a separate AC line. Plugging the DC “injector” into a UPS will keep dedicated VOIP phones functioning during a power outage. Terry Schmidt has written a nice guide covering the theory behind scratch building poe injectors and taps. It also has photos and descriptions of other peoples projects along with tips on how to keep from turning your router into a pile of plastic goo.

Continue reading “Power Over Ethernet” →