links

Links for further detail.

•                 https://www.orbitals.com/self/survey/chain/chain.htm 
•                   https://civilseek.com/tacheometric-surveying/
•           https://www.merriam-webster.com/dictionary/cosmolabe
•           http://www.finedictionary.com/Graphometer.html
•           https://www.engineersupply.com/theodolites.aspx
•          //www.gim-international.com/content/article/robotic-theodolites-rts
•           http://www.johnsonlevel.com/News/TheodolitesAllAboutTheodo
•            http://kotsanas.com/gb/exh.php?exhibit=1301002
•            http://lensaticcompass.blogspot.com/2008/09/what-is-lensatic-compass.html
•            https://theconstructor.org/surveying/electronic-distance-measurement-               instrument/6576/
•           https://theconstructor.org/surveying/how-to-use-planimeter-parts/14821/
•           https://www.engineersupply.com/automatic-levels.aspx
•           https://www.aboutcivil.org/what-is-phototheodolite