The Abney Level Handbook #220838

Next to the compass the Abney is probably the most essential and popular surveying instrument in use in the Forest Service. The numerous activities to which it is adapted, its stability and simplicity of design, its ease and speed of manipulation, and the relatively high precision that is so readily obtained by the careful and experienced Operator have made this instrument a favorite of all practical field men who have had an Opportunity to give it a thorough trial.