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Historical Review of Measurements Using Invar Wires in Serbia (5546)

Siniša Delčev, Vukan Ogrizović and Jelena Gučević (Serbia)
Dr. Siniša Delčev
Assistant Professor
University of Belgrade
Faculty of Civil Engineering
Department of Geodesy and Geoinformatics
Bul. kralja Aleksandra 73
Belgrade
11000
Serbia
 
Corresponding author Dr. Siniša Delčev (email: delcev[at]grf.bg.ac.rs, tel.: +381113370293)
 

[ abstract ] [ paper ] [ handouts ]

Published on the web 2012-02-02
Received 2011-11-03 / Accepted 2012-02-02
This paper is one of selection of papers published for the FIG Working Week 2012 in Rome, Italy and has undergone the FIG Peer Review Process.

FIG Working Week 2012
ISBN 97887-90907-98-3 ISSN 2307-4086
http://www.fig.net/resources/proceedings/fig_proceedings/fig2012/index.htm

Abstract

Precise measurement of long lengths, especially in 1st order trigonometric networks, was always a problem to geodesists, Lengths should be measured in order to define the scale of a network. Thanks to E. Snelius and his work [5], a shorter length could be measured in a flat land, and than one could transfer its scale to a length between two trigonometric points, only by measuring angles. Nevertheless, it was not able to perform such measurements with the sufficient accuracy. The lengths were measured by wooden or metal levers, but the required accuracy needed for scale definition of the trigonometric networks was reached not until the invention of invar wires. Serbia was one of the first countries obtaining and using the invar wires for the length measurements within the 1st order trigonometric network. The appearance of the invar wires and the Jäderin device for the length measurement coincided with the work on 1st order triangulation network in Serbia. In the beginning of 20th century, Serbian general Stevan Bošković was attending the training on triangulation procedures in France. In the same time, the invar wires were testing in the same place. Gen. Bošković realized the possibilities of using the invar wires in geodesy. Thanks to him, first measurements with the invar wires in Serbia were performed in 1904. One of the invar wires used in the measurements was numbered with “0” (zero).
 
Keywords: History

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