Show bronfen brock WIRE how HOT the ahe telegraph operator tell where the break U I 1 located Per perhaps bapp the greatest of all mysteries to the about telegraphy is ig ib tbt fact when hen a wire is broken oi or dabi damaged aged the operator sitting in his office can tell exactly where the accident the i ls tery ery v simple it requires force to send electricity through a wire just as it does to pump water t a hose the longer the wire is the greater is the force required this force forca is mea measured 4 but instead of calling calli ngit it pounds as in the measuring the pressure in a ilir electricians call the units of electrical tri ca I 1 force ohme wf dw suppose a wire between Hwo offices is 0 emles long and that on a a toy stormy to y laetit lit gets brokel ake ite knows that when the he t wire wire was sound it takes just 2000 ohms to send a current through or 14 ohms pez pec mile ile he now finds that he can send aa current with only ohms he divides by 14 and finds that the break in the wire is 50 miles from his end when the wire is under the sea acu a cn i rious thing happens the electric electricity itz decomposes the sea salt and a new salt is formed on the broken ends of the icib wire and until that is cleared away anay an ay by what is called a zinc current acting fo for ten or twelve hours no measure roen en can cai be made |