This official handbook of the U.
S.
This edition faithfully reproduces the words and instructions given, and includes all of the diagrams, graphs, drawings and charts present in the 1935 version..
The Abney Level Handbook , first published in 1927 and expanded in 1935, remains the authoritative source simply as it covers the subject exhaustively well.
At roughly $60-100 in price it is affordable, durable, lightweight and - being handheld - portable.
The Abney Level is used to this day by land surveyors, geologists, foresters, and safety inspectors; in good hands, it is reliable for its accuracy.
Yule - were themselves Experienced reconnaissance surveyors with ample experience traversing and measuring the rugged woodland landscapes of North America.
B.
The authors - Hartley Calkins and Y. government commissioned handbook offers exhaustive demonstration and instruction on the tool\'s abilities.
Though earlier guides cover its basic usage, this U.
S.
By the time the device was recognized and widely-used in the early 20 th century, it had been refined.
The Abney Tool was invented by William de Wiveleslie Abney, an English astronomer, during the 1870s.
Forest Service explains how to use the Abney Hand level, a Clinometer Tool used to measure angles in various natural environments.
This official handbook of the U.
S
