There is one further experiment that I could perform with the equipment that I have available.
That is to set up a (103 + 108) metres (211 metres) local loop and connect a Rheostat No 1A in series with one leg of the loop. The rheostat has a range of 0 - 9999 Ohms (10000 Ohms range) and by gradually increasing the resistance, mimic the appearance of a resistive fault within the circuit.
To harvest results at every one Ohm would be an impossible task (10000 experiments); likewise harvesting results at every 10 Ohms (1000 experiments) or 100 Ohms (100 experiments).
However harvesting results at every 1000 Ohms (10 experiments) would be a feasible task . . . Perhaps I should perform a few preliminary experiments to see how the circuit behaves. Hmm . . . Use inserted resistances of 0, 1, 10, 100, 1000, 9999 Ohms to get a "feel" for the circuit's response and then plan a more extensive experimental sequence based on the preliminary results.
Input and suggestions from interested
kitizens will be appreciated.