the particle size must be smaller than the graphite flakes within the rock. A series of grinding processes with ball mills and rod mills accomplishes this. Depending on the rock type and graphite ...

But these rods aren’t all the same. Crankbait rods were introduced in the late 1980s, when fast-action graphite blanks ruled the market. While sensitive and lightweight, their inflexibility made ...

The Italian's were first to apply the wooden holders to the graphite rods. Although flat and oval shaped, their first use was carpentry. The eraser was then added in 1858 by Hymen Lipman who ...