Serious question about safety as I dont work with UV on a regular basis. I have looked at getting / building a UV to explorer rocks I gather the shorter the wavelength the more that things fluoresce? but also the shorter the wavelength the higher the danger to the eye as we don't see it and so...

This was open at least 2-3 years ago pretty sure there is another open adit near by too. Didn't have any gear with me at the time and it was quite wet looking

I dont know the name but have explored it and dropped the shaft above in an attempt to connect it. DJ who gave us the guided toor described the white clay mineral as a hexagonal plane similar to the clays used for the firebricks across the bay (an excellent place for an explore)

is it where a mineral was discovered ? similar to the clay for the firebricks round the headland ?

So our burner has just started doing this after replacing the sealing rope. Opening the door a smidge (breaking the seal) then waiting before fully opening is defiantly helping a lot as the smoke comes out next to the side of the door that opens the most. Closing the Wash before opening also...

magnetic switch would be simpler and easier to control ... reed switch in box with relay to be main switch and then bring a magnet next to the box to turn it on

for all balance your radiators fit smart TRV's (dont heat a room your not using / in) if your boiler is a condensing one turn the ch loop water temp down as the lower the temp the better the return on condensate is.

Sorry I was meaning was that GPS is never an option for corrections for an IMU on a phone. The IMU is combined with photographic and/or scanning to correct the IMU errors.

Its not back fixing using GPS thats too inaccurate for the measurements. code wise some details here: https://developer.apple.com/documentation/arkit/content_anchors/visualizing_and_interacting_with_a_reconstructed_scene They also recommend a good light Light the object with an illuminance of...

Great work keep at at :)

That is very sad news. I knew Alan well for a time though haven't seen him much for the past few years due to family commitments. He always told a good story with a smile and a laugh. Please pass on my regards David

I have been wondering what (if any) LED upgrade options there are now for the rebel versions ? And would Roy be willing / able to upgrade the LED's in older STENS in the UK ?

I have a small adapter for bosch 18v battery to give 2 usb and a 12v. This is very handy for running a fridge when camping and charging stuff. A fast charger for the 18V batteries at 8A Not what your asking for but handy to think about.

Colin discovers a small cave draft while digging a "secret" tunnel. I am impressed with his stealth digging tools. https://www.youtube.com/watch?v=0dYMRj9whp4

if its drastically slower thats probably an indication that the hard disk is on its way out. make sure you have backups (time machine is great) and that they are up to date Fitting and SSD will make a MASSIVE difference regardless though you might need an app afterwards to stop the fans running...