Trying to deal with wildfire smoke? Here's the best thing since sliced bread for massively improving the air quality in your room/apartment/house/etc.

How to build your own Corsi-Rosenthal Box

https://corsirosenthalfoundation.org/instructions/

#wildfires #SandyFire #smoke #aqi

One of these things is not like the others... (see 2nd pic)

Fun to finally have a reliable setup for measuring ±1 ns PPS (and a solid Rubidium reference) among all my clocks!

Adding another clock every few days... and probably no video on this stuff for months!

New part coming soon for my #HamRadio Single-paddle #MorseCode key system. This is a base that you can glue magnets into, for using the key on a steel block like the commonly-used jeweler's blocks. Like the rest of my system, it is parametric, designed to be easily modified in FreeCAD. The screen shot is an example for using a dozen ¼" magnets. However, the size of the hole for the magnet (6.55mm for 6.35mm ¼" magnets), depth of the hole, thickness of the block, and number of magnets in each direction are all parameters that you can tweak.

Please respond with a size of magnet that you have that you would want to use with this system! I'll use your responses to create some variations on this part to include in the next release. Sizes can be in metric or US customary units.