Alidade : An alidade is a straight-edge ruler provided with sighting device. It is used for sighting the object and drawing the line.
Arrow : An arrow is inserted into the ground after every chain length measured on the ground.
Bubble tube : These vials are incompletely filled with a liquid usually a colored spirit or alcohol, leaving a bubble in the tube.
Stadia hair : Stadia hair are crosshairs on the reticle of a theodolite or other surveying instru-ment that allow stadia metric range finding.