What is the name given to copper bars arranged in a cylinder, insulated from each other which rotates to connect each section of the armature in turn (in a motor) or to the external current (in a dynamo)?
What name is given to musical lines that sound different and move independently from each other, but sound harmonious when played simultaneously?
A glockenspiel, a percussion instrument with tuned metal keys arranged like a piano keyboard, gets its name from German. Roughly what does it mean?
