The methods used in primary level and triangulation work in unsettled and broken country (1909)
Stewart, John Truesdale · leaf 260
/J C £ - Port/on of s/^nai illuminated.& c~ D = f^ort/on of sign at observed.£ - Center ofsignal as observedfrom distant sfaf/on. Sketch sA otv//7jf error due to ohs erwng an iJ/uminal/edsijpna Iwhen //ne of sight is notparat/el to suns rays. … Jk1
Geodesy · Surveying · Triangulation · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Works. Popular edition.] 2 series (1886)](https://img.insideoutlibrary.com/img/200/bl-bl_003191336_9-284-1.webp)
