On Sun, 27 Nov 2011 12:32:45 -0600, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

Gunner Asch fired this volley in
:

They are obviously plugs put into the base metal.
What was the base..some sort of saw blade? It has the knock out in
the
center


That was odd, but I assumed he'd soldered a thin sheet of brass to a saw
blade backing.

He did say he was etching brass, not steel.

It's not out of the question that the conductivity of the whole affair is
different over the "cutouts".


The brass piece is 2.5"x2.5" of 0.020" stock. The hole in the middle
allows a 10-32 screw to hold it to a 1" plastic spacer. The other end
of the spacer is attached to the cathode:

http://www.flickr.com/photos/2768312...57625256724344

I had the assembly with the anode "face down" i.e. on top as there is
a lot of copper chunks falling down on the cathode. I was not
observing the process very closely as I have done it hundred times
before the same way with other pieces and had no problems. That was,
however, using a commercial copper-plating electrolyte. I do not have
enough of it so I made a bigger batch from scratch. The main
difference: I omitted the sulphuric acid.

I should probably get some and try it again with it as well as watch
more closely for the bubbles.

Michael Koblic,
Campbell River, BC