On Thu, 19 Jan 2017 21:39:23 -0000, Dave Liquorice wrote:

On Wed, 18 Jan 2017 21:44:23 -0000, James Wilkinson Sword wrote:

How does the detector work? So whatever it does it only senses liquid
water?

Scatter/reflection of infrared light from blobs of water on the
screen I think. Snow and frost aren't blobs...

Clever, I thought it was just electrical resistance.

And doesn't frost reflect just like water?

--
The fact that a believer is happier than a skeptic is no more to the point than the fact that a drunken man is happier than a sober one -- George Bernard Shaw