The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

Category: Oddities

Who’d’a thunk it?

  • Why I Don’t Like Hotel Networks

    Perhaps this indicates most folks can’t configure network encryption with known parameters, but advising everybody to just turn that pesky WEP stuff off seems, well, misguided:

    Disable WEP
    Disable WEP

    Sniffing a guest’s private bits from an unencrypted link doesn’t pose any challenge at all and, given the hotel’s location in Hartford’s hot urban core, I’d expect absolutely no security-by-obscurity whatsoever.

    On the other paw, Dragorn of Kismet points out the triviality of a man-in-the-middle WiFi attack no matter what encryption you might (think you) have in effect. So maybe it doesn’t make much difference.

    And if you think the wired network is inherently more secure, that should change your mind.

  • Panic Button Variations

    Those panic buttons in the high school cafeteria still beg the question: who thought panic buttons would be a Good Idea? I recently served as a judge for the Science Fair qualification show and found some variations on the theme.

    One seems in good shape, although I don’t know if it’s been repaired:

    Intact panic button
    Intact panic button

    Several have missing buttons, but the innards seem intact:

    Buttonless panic button
    Buttonless panic button

    In the event of an actual panic, I suppose you simply yank the cage off the wall:

    Up-armored panic button
    Up-armored panic button

    I cannot imagine what logic justified protecting one button and leaving the others to the tender mercies of the student population.

    Our tax dollars at work, for sure…

  • Cassini Saturn Orbiter vs. Tin Whiskers

    Although I don’t often block-quote other sources, for this I’ll make an exception:

    The Cassini Plasma Spectrometer (CAPS, off since June 2011) was powered back on on March 16 based on the unanimous agreement of the review board at the CAPS turn-on review held on March 8. All went as planned for both the instrument and the spacecraft during the turn-on. The high rail to chassis short internal to the instrument that was part of what prompted it to be turned off last June was not present, and no changes were seen in the bus voltages or currents when the turn-on occurred. On Tuesday, March 20, the high rail to chassis short in the CAPS instrument returned, generating the same condition that existed at the time the instrument was turned off. However, based on the tin whisker model developed by the NESC team, this condition is believed to be understood and is not expected to cause any problems for either the instrument or the spacecraft. The CAPS instrument has been left powered on and is sequenced to operate as originally planned for the 75 kilometer Enceladus flyby coming up on March 27.

    Having seen a forest of tin whiskers myself, that’s a pretty scary diagnosis. One assumes NASA takes extensive precautions, based on their experience, but … 15 years in hard vacuum and free fall will do odd things to spacecraft.

    Remember those Toyota unintended acceleration problems? Guess what caused some of them: yup. Read their report to find out what makes metal whiskers so hard to detect. Hint: combine a minimum threshold voltage with a very low current capacity.

    You could subscribe to the Cassini Significant Events newsletter.

  • CH-47 Flyover

    I have no idea what’s going on around here any more…

    CH-47 helicopter formation
    CH-47 helicopter formation

    Those northbound CH-47 Chinooks looked to be barely over treetop level, but the rotors are 60 feet in diameter and they were much higher than they seemed. Shook the house and brought all hands outside to watch the show.

    I remember getting a tour inside one, a long time ago, at a military air show.

  • Bald Cardinal

    Something weird is going on with the Northern Cardinals at our feeder. First a female missing a leg, now a male minus his head feathers:

    Bald Cardinal - right side
    Bald Cardinal – right side

    A view from the other side:

    Bald Cardinal - left side
    Bald Cardinal – left side

    A bit of searching with the obvious keywords produced that writeup, which suggests feather mites or other parasites. Given that this was in March, that cardinal is definitely not molting!

    Those pictures are tight crops from a hand-held Canon SX230HS at dusk, through two layers of 1950-vintage glass. Sorry about that, but the bird spooks whenever I crack the door open for a better view.

  • Helicopter Flyover

    Helicopter formation
    Helicopter formation

    While I was puttering around outside (an admittedly rare occurrence), a deep thuttering over the northern horizon eventually resolved into a formation of four helicopters. Hard to tell at this range, but they looked like Black Hawks southbound for the Stewart Air National Guard field.

    Our Larval Engineer reports that the college ROTC contingent includes some pilots-in-training who regularly land Black Hawks on the campus outfields.

    We are, fortunately, not in a part of the world where Bruce Cockburn’s commentary applies…

  • Not a Hand Hole

    Abraham Lincoln once observed that calling a tail a leg doesn’t make it a leg, which seems to apply perfectly to this situation:

    Not a Hand Hole
    Not a Hand Hole

    Surely, the real reason boils down to:

    • A warehouse full of boxes with pre-cut hand holes
    • A stack of returns due to guys poking their hands too far into the boxes
    • A desire to disallow said returns

    I bet they pick up the box that way, too.