Michael Idvorsky Pupin was American physicist who devised a
means of greatly extending the range of long-distance telephone
communication by placing loading coils of wire at predetermined
intervals along the transmitting wire. He invented the tuned
oscillating circuit, which made possible the simultaneous
transmission of several messages. Pupin’s house in Idvory
Michael (Mihailo) Idvarsky Pupin was born in Idvor, little
Serbian village, in province of Banat near Belgrade, on October
9, 1854. He watched at night with other village boys to keep the
oxes from straying beyond their pasture into the fields of tall
corn and falling prey to the cattle-thieves who lay there in
hiding. Later he wrote: “My life as a scientist began with the
questions I asked myself in the blackness of midnight when I lay
with my ear pressed to the ground listening to the secret code
of our little band of village boys.” The young herdsmen were
trained by their leader to send signals through the ground to
each other in time of danger. Wi