The original ones came with a USB C Y cable that allowed you to connect to the computer but get power from an alternate USB source. They also have beards on the board for DC power.
"Belt and braces" (UK) vs. "belt and suspenders" (US). I'm pretty sure the phrases have the same meaning, they just use a different word to refer to the thing that holds pants|trousers up.
My dad's lived in the same house for over 15 years and probably expected as much when he moved in. He has a room with old books covering the walls, which he never reads. If he moved house every year, he'd have to throw out or donate the collection.
There are a few knockoff options too, which are not quite as nicely calibrated, but get the job done for much less than Fluke-level prices. Like the FOTRIC TD2.
These are the kinds of things you look at and think - maybe I DO need night-vision, or a soldering iron with a cpu, or a thermal imager, or a steerable endoscope or now an acoustic imager....
+1 to thermal imager. I use mine to locate hot wires, heating and cooling gaps in the roof and around windows, car maintenance, the pizza oven, and its even sensitive enough to ‘see’ studs in the wall.
Priceless on one occasion for finding leaks in the ceiling, which are notoriously hard to pinpoint.
Can also be used for looking at heat leaking into or out of your house via conduction, which can help you determine where there might be more insulation needed, or maybe a particular wall needs more shade in summer.
Has anyone tried acoustic imaging for water leaks inside walls? I live in a multi-floor 1900s Victorian. A leak can affect several units, and tracing the source can mean opening walls or floors in multiple places, and coordinating access has been getting harder with less WFH.
Could one of these tools help map water pipe routes and trace a leak, or are they only going to be useful for air and gas leaks?
Initially I scoffed, but then I recalled that certain RF bands are disproportionately absorbed by water and this is used for certain sorts of atmospheric imaging by satellites. So you'd need a moisture "light" and an RF camera. Other than being cost prohibitive it sounds like an awesome toy.
It still works pretty well in the IR band. I know that one from experience due to storm damage to our roof ;-)
A leak only turns invisible if the water has the exact same temperature as the wall and there is no meaningful evaporation happening (as that cools the affected area).
Of course don't let me stop you from actively probing your all using RF. Though also there you might have good chances with IR, since wet $stuff should behave differently than dry $stuff ;-)
There is a man call leak detective, who hunts for leaks in the UK. one tool he has is shutting off the water and filling the pipes with gas and using either sound or gas detector to pin down leaks.
Up until the 90’s airline in flight entertainment use stethoscope style earphones. My dad used to steal them for his workshop as a way to hear for leaks in various parts.
Our ears and eyes are very high bandwidth sensors.
Interestingly Greene’s Dictionary of Slang cites more than a century of US use of “jab” for injection. Seems like it must have died out in the US and revived a bit lately.
If this article is interesting to you I highly recommend War of the Whales. It is an interesting look at Cold war science+politics and the environment. A decent part of the book is about SOSUS.
Hughes had many class As. Rockwell had a few. McDonnell Douglas had some. Boeing had a few. Boeing eventually acquired all of the above. It's possible that they've divested some of them by now. I haven't worked there for almost 10 years.
Well then they've apparently sold them. They had a lot of /8s 10-15 years ago. I used Boeing as an example of wasted IPv4 space and I guess they've trimmed the waste. If all the other companies that are hoarding IPv4 space did the same, everybody would benefit. Someday IPv6 will be "fully deployed" and the IPv4 space will be a relic from the past.
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