New TL-Series Theodolites Thanks to the use of special alloys, Topcona#39;s new TL- series of theodolites weighs in at only ... The horizontal angle reading is the mean of graduations on opposite sides of the circle for models TL-10E, TL-20E andanbsp;...
|Title||:||U.S. government publications about-- surveying and mapping|
|Author||:||United States. Superintendent of Documents|