berkeman's latest activity

In the USA low voltage wiring such as data, speaker wires, etc are not allowed to run in the same conduit and eventually receptacle box...

Boston Molasses flood https://en.wikipedia.org/wiki/Great_Molasses_Flood On January 15, 1919, a molasses tank at 529 Commercial Street...

It is standard practice these days for the ground connection to be made first and broken last when HV connectors are inserted or...

Would it be big enough for 15A conductors? Again, thinking through the sequential connection, when inserting the jack you would briefly...

Hello there, and nice to meet all of you! My name is Olga, I am from Russia. I have a PhD in laser physics, and I work at the local...

Ohhh! Thanks. I thought it was some new-fangled text speak thing. LOL

Happy Thanksgiving, and safe and pleasant travels to and from visiting with family, friends, colleagues and associates.

Dan was my PhD advisor. I learned a lot from him. He was a blessing to me.

As I might not have time tomorrow, this is for those who do celebrate it.

I think that the drawing would be more accurately drawn if the lightning hit the tree instead of the ground on its left. As negative...

There are a few compass apps for Android https://www.androidauthority.com/best-compass-apps-android-2-954789/

Welcome to PF. That would seem to be a good thing to try. You could even try drying rice in an oven and then quickly putting that into...

Thank you very much, Astronuc. I think this has cleared everything up for me. By the way, the video you linked to uses figures (by...

There are standard optical components used for generating lines from laser beams, known as Powell lenses. These lenses are manufactured...