Head Pulley
The terminal pulley located at the discharge point of a conveyor belt. On many conveyors, the head pulley is coupled to the drive motor to power the conveyor.
Gravimeter
An instrument used in gravity surveying to measure changes in the value of gravity over an area.
Fine Aggregate
Graded material which, in the case of concrete aggregate, is smaller than 4mm, and for road-making material is below 2mm.