Later the rotation was effected by a cupped copper disc called a "gas check" attached to the base end of the projectile.

Thanks to you, I have eyes that look like two corroded copper discs and eating habits that make people stare.

This counterflow limited the power output to the pickup wires, and induced waste heating of the copper disc.

The tube has a copper disc at the bottom, also held in place by asphalt.

Could copper discs be manufactured with the required precision in Iraq?

They go through the leather/cardboard disc, and meet the copper disc.

This gives the electrons left behind in the zinc disc a "chance" to go to the copper disc.

The copper disc glowed bright orange with the heat of its spin.

The copper disc could be as thick or as thin as desired.

The individual was placed in a cane coffin that was covered with copper discs.