Before revision: For rough or approximate survey work, the ordinary method of measuring horizontal angles is less time consuming.Surveying Volume 1 by Dr. B.C Punmia, Dr. Ashok Kumar Jain and Dr. Arun Kumar Jain.
After revision: used as it isFor rough or approximate survey work, the ordinary method of measuring horizontal angles is less time consuming.Surveying Volume 1 by Dr. B.C Punmia, Dr. Ashok Kumar Jain and Dr. Arun Kumar Jain.