This article describes an interesting and inexpensive laboratory experiment for undergraduate students of electronics, geography and related disciplines. The objective of the proposed experiment is to improve the students’ exposure on the basic principles of instrumentation and to demonstrate an electronic measurement system. A simple electronic curvy length measurement system is presented here. Such a system can be used to measure curvy lengths e.g. length of a river, road or railway line etc. from topographical map. The proposed system is composed of simple functional blocks which are usually demonstrated in laboratory or in theory course of electronics at the undergraduate level. The experiment is assigned to a group of students and it is found that the experiment can fulfill its objectives with high degree of satisfaction.
 Web page: http://circuitelec.blogspot.com/2009/03/rotary-encoder-circuit.html.
 Web page: http://electronicdesign.com/article/analog-and-mixed-signal/simple-quadrature-decoder-suits-rotary-encoders214.
 Texas Instrument, "Data Sheet: SN7414, HEX Schmitt-Trigger Inverters”, December 1983.
 Diptiman Ray Chaudhuri, Digital Circuits. Volume – II. Kolkata: Platinum Publishers, 2009, ch. 15.
 Diptiman Ray Chaudhuri, Digital Circuits. Volume – II. Kolkata: Platinum Publishers, 2009, ch. 13.
 Diptiman Ray Chaudhuri, Digital Circuits. Volume – I. Kolkata: Platinum Publishers, 2009, ch. 8.11.