There are three classes of levers, depending on the relative positions of the effort is applied, load, and fulcrum. 1  First-class levers have the fulcrum located between the load and the effort (LFE). If the two arms of the lever are of equal length, the effort must be equal to the load.
1 Ebro: From the 120 Foot level of the new cell tower, This is Ebro.
Physically speaking, the Dobro is easier to play than the other five instruments in certain ways. It is played with a bar made of solid steel. The bar has some weight to it, so thereâs no need to press down hard on the strings (making this easy work for arthritic fingers).