bunsen_h: (Default)
I've been playing with copper compounds for the last few months.  The goal is to work out good methods of plating copper onto stainless steel, so I can make a sturdy electrical connection to it, so I can accomplish a project I've had in mind for a few years.
 
Details of the chemistry and process... )

What I got was this:

Copper/ammonia precipitate 1 Copper/ammonia precipitate 2

This is a thin surface crust on the solution, and I think that it consists of dark-blue copper/ammonia salts, with veins of light-blue copper hydroxide.  The veining appears to be increasing over a period of days.  It shows best if the jar is strongly lit from the side, minimizing highlights and reflections from the dark areas.  This is a temporary state, since the crust is thin and fragile, and the veins should eventually spread to cover the surface as more ammonia evaporates.  All of this is a fortunate accident resulting from my desire to play further with a "failure".
bunsen_h: (Popperi)
I've been trying to find a good location for the can crusher from Lee Valley, and have run up against one complication of my house.  Its interior walls are (for the most part) constructed from a material that's closer to sheet concrete than standard drywall, and the nails/screws attaching these sheets to the studs are deeply buried, and well masked.  Finding the studs is therefore a bit tricky.  The "percussion" method, tapping the wall to find where it sounds less hollow, doesn't work well.  Magnetism-based stud finders are also unreliable, since the vibration from sliding the tool across the wall messes up the indication of where the nail is lurking... the attraction between the magnet and the screws is weak.

Last night, I had an idea: a pair of rare-earth disk magnets with a thread caught between them.  I used a thread length of about 15 cm, held the free end to the wall, and let the magnets swing gently back and forth as a pendulum.  I moved the top end around slowly, to keep the pendulum swinging, and quickly found some hidden screws.  Because the weight of the magnets was being supported by the thread, and I was watching for changes in the pendulum's motion instead of trying to see if it was moving at all relative to some fixed point, I had a much more sensitive detector for the buried metal.  One's eye is very sensitive to changes in the motion of an object that's supposed to be moving smoothly on a fixed path.

On the down side, there aren't any wall studs behind any of the areas of the kitchen walls that might be convenient for the can crusher to be located.
 

July 2025

S M T W T F S
  1 2345
6789101112
13141516171819
20212223242526
2728293031  

Syndicate

RSS Atom

Most Popular Tags

Style Credit

Expand Cut Tags

No cut tags
Page generated Jul. 15th, 2025 01:25 am
Powered by Dreamwidth Studios