Adventures in Research 43-03-30 Steel That Floats

Summary

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Adventures in Research – "Steel That Floats"

Podcast: Harold's Old Time Radio
Episode Air Date: October 4, 2025
Original Broadcast: March 30, 1943
Host/Narrator: Paul Shannon
Theme: The remarkable journey and scientific achievements of Michael Pupin, a Serbian immigrant who rose from poverty to become a pioneering American inventor and educator.

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Overview

This episode of Adventures in Research recounts the inspiring life of Michael Pupin: from humble beginnings in a Serbian village to his emergence as a celebrated innovator in America. Through dramatized vignettes and narration, Pupin's story illustrates the power of education, perseverance, and ingenuity in advancing science and changing the world.

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Main Discussion Points & Insights

1. Early Life in Serbia

• Cultural Traditions & Early Lessons

  • Michael's father teaches him the local custom of detecting cattle thieves using vibrations transferred through solid earth.
  • Demonstrates the principle that "sound travels through the ground far better than through the air" (03:23).
  • Foreshadows Pupin's later work in mechanical and electrical vibrations.

• Notable Quote:

  "Learning is the light which illuminates our path through this life and leads to a future life of everlasting glory." — Michael's Father (04:29)

2. The Immigrant Experience in America

• Arrival at Castle Garden, NYC

  • Young Michael arrives nearly penniless, with no friends or relatives, and is challenged by immigration officials.
  • His knowledge of American icons (Franklin, Lincoln) resonates with his examiners.
  • Allowed entry despite "no skills" but full of determination to learn.

• Struggles & Odd Jobs

  • Works a range of low-paying jobs: farmhand, mule-tender, basement painter, factory worker (06:41).
  • Befriends a kind boiler-room engineer, "Mr. Jim," who gives him a dictionary and encourages schooling.

• Memorable Dialogue:

  “No, no, my lad. You must aim higher, much higher. That takes book learning. Here, I brought you a present. It's secondhand, but it's still good.” — Mr. Jim (07:30)

3. Education & Scientific Aspiration

• Learning English and History

  • Michael works diligently to learn English and American history, reciting famous speeches and poems (08:38–08:48).
  • Dream: "I wish to learn very much... This is a growing country. There's opportunity all over this land." (08:06–08:10)

• Inspiration from Inventors:

  • Inspired by portraits of innovators like Morse, McCormick, and Franklin in the school library (09:05–09:29).
  • Declares: "This is what I wish to become. A man of science. Like these men in the picture." (09:31)

4. Academic Rise and Research at Columbia

• Advanced Study Abroad

  • Wins Tyndall Fellowship, studies at Cambridge and University of Berlin under von Helmholtz (09:42–10:11).
  • Returns to teach and research at Columbia's nascent electrical engineering department, despite sparse facilities ("looks like a cow shed" — 10:29).

• Humor and Motivation:

  "You have no idea how rapidly an inexperienced teacher expands when he tries to teach a new subject to pupils who are poorly prepared." — Crocker, Michael's colleague (10:59)

5. Pioneering Scientific Accomplishments

• Invention: Selective Tuning in Wireless Communication

  • Pupin applies lessons from sound-vibrations in Serbia to electrical circuits.
  • Explains the analogy between tuning a knife in the ground and electrical circuits using coil and condenser (12:03–12:44).
  • Invention of "selective tuning" allows radio receivers to isolate distinct signals, paving the way for modern radio.

• Telephone Repeaters: Long-distance Communication

  • Introduces the concept of placing induction coils at intervals on telephone lines to allow long-distance calls (12:56–13:31).

  “Localized induction coils placed at predetermined intervals in the line will maintain the desired tone distinctions and power of signal.” — Michael Pupin (13:19)

• Broader Impact

  • Further discoveries include secondary X-ray radiation and major improvements to telegraph and wireless technologies.
  • “Michael Pepin was indeed a versatile man of science... an inspiring adventure in research.” (13:31–14:05)

6. Recognition and Legacy

• Awards and Honors Received:
  • Elliott Cresson Medal, Edison Medal, Ibert Prize of the French Academy, presidency of several scientific academies (13:47–13:59).
  • 18 honorary degrees — testament to his stature in science and education.

“Such was the career of Michael Puppin, the one time Serbian shepherd boy who made of his opportunities in a free land and inspiring adventure in research.” — Narrator (14:05)

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Notable Quotes & Memorable Moments

• On the Power of Education:
  “The eyes of reading and writing. Learning is the light which illuminates our path through this life.” — Michael's Father (04:29)
• Fundamentals of Sound & Electric Vibrations:
  “We know that sound travels through the ground far better than through the air.” — Michael's Father (03:23) "An electrical resonator... is a perfect parallel to the acoustical resonator." — Michael Pupin (12:35)
• On American Opportunity:
  “This is a growing country. There's opportunity all over this land. Study, go to school. Prepare yourself for when your chance comes.” — Mr. Jim (08:10)

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Key Timestamps

• 01:39 – Michael's father teaches the principle of vibration transmission through earth
• 04:29 – Parting advice from Michael’s father on the value of learning
• 05:27 – Immigration interview, Michael expresses admiration for American heroes
• 07:45 – Michael receives a dictionary; importance of language and education
• 09:10 – Michael’s inspiration by prominent American inventors
• 12:03 – Pupin explains selective tuning in radio circuits
• 12:56 – Explanation of telephone repeaters and long-distance calling
• 13:47 – Summary of awards and scientific honors

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Conclusion

Through a vibrant blend of storytelling, dramatization, and accessible science, this episode offers an engaging tribute to Michael Pupin. It highlights the impact of curiosity, resilience, and education, while illustrating the deep connections between unlikely experiences (like listening for cattle thieves in a Serbian pasture) and some of the most transformative innovations in modern communication.

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Transcript

[A]

And Doug, here we have the Limu emu in its natural habitat, helping people customize their car insurance and save hundreds with Liberty Mutual. Fascinating. It's accompanied by his natural ally, Doug.

[B]

Limu is that guy with the binoculars watching us?

[A]

Cut the camera. They see us. Only pay for what you [e-mail] Liberty.

[C]

Liberty. Liberty.

[D]

Liberty Savings.

[A]

Very unwritten by Liberty Mutual Insurance Company and affiliates.

[D]

Excludes Massachusetts. Adventures in Research this is Paul Shannon bringing you another transcribed story of science, produced as a public service in cooperation with the Westinghouse Research Laboratories and today bringing you the unusual story of an immigrant boy named Michael Puppin, who came to America penniless and unlearned, but through determination and industry rose to fame as an educator and inventor in his adopted land some 80 or 85 years ago. And in a small Serbian village of Ivor, there lived a farm family by the name of Pupin. Life was hard and everyone had to do his share of work, Even young Michael, 12 years of age.

[C]

Michael, listen closely to what I say.

[E]

Yes, Father.

[C]

I have brought you here tonight to the pasture to watch the oxen. It's very dark and no easy task for a small boy. Now, during the day, the sun and the heat force the oxen to keep cool under the shade trees, but at night they are hungry and wish to feed. Now, do you see that cornfield over there?

[E]

Yes, Father.

[C]

When the breeze from the cornfield carries the sweetness of the young corn to the oxen, they will stray into those fields unless you watch them.

[E]

I will watch them close, very closely.

[C]

Watching is not enough. A greater danger hides in the cornfield.

[E]

Danger, Father?

[C]

Cattle thieves. They hide in the corn fields at night, and whenever an ox strays there to feast on the corn, they steal the animal away in the dark.

[E]

How shall I prevent this?

[C]

See this long night?

[E]

Yes, Father.

[C]

Now I stick it deep into. Into the earth. So now. Now lie down, Michael, and press your ear against the earth. Close. Now, are you ready?

[E]

Ready, Father.

[C]

Now I will strike the wooden handle of the knife. Do you hear it, son?

[E]

Very clearly.

[C]

Now press your ear against the handle of the knife. Tell me, what do you hear now?

[E]

I. I hear. Yes. It is the sound of the hooves of the oxen moving about in the pasture.

[C]

That is right.

[E]

Why is this, Father?

[C]

In Serbia, among the farmers, it is an old custom. We know that sound travels through the ground far better than through the air. And hard earth carries sound much better than plowed up earth. So, Michael, it is your duty to lie here at night with your ear pressed against the Knife's handle. Should you hear the oxen stray away into the corn fields, strike the handle of your knife sharply. That will signal other boys in the pasture nearby, and they will come running to help you.

[E]

And the cattle thieves, Will they not hear our signal?

[C]

Where they hide, the earth is soft. They will not hear your signal.

[D]

This was Michael Pepin's first acquaintanceship with the phenomena of mechanical vibrations, a fact which stood him in good stead in later years. A few years later, the Poin family gave permission to Michael to leave for America, there to seek his fortune.

[C]

My son, we are poor and therefore cannot send you out into the world blessed with riches. But advice from a father's heart, this I can give to you. Michael, my son, if you wish to make your name in the world, provide yourself with another pair of eyes. The eyes of reading and writing. Learning is the light which illuminates our path through this life and leads to a future life of everlasting glory.

[D]

The ship carrying young Poupin to America docked at Hoboken, and the immigrants transferred to Castle Garden to be questioned by the admittance officers. How old are you, boy?

[E]

Fifteen.

[D]

What country?

[E]

Serbia.

[D]

Well, the immigration law of this country requires that you have sufficient funds on your person so that you will not become a public charge. How much money did you bring with you to America?

[E]

Only this much.

[D]

5 cents. Why, you must be joking.

[E]

That is all I have.

[D]

Do you have relatives here?

[E]

No relatives.

[D]

Any friends?

[E]

No friends.

[D]

Don't you know anyone in this country?

[E]

Oh, yes. Yes, in Serbia. I study in school about Benjamin Franklin and his kite. And I know Abraham Lincoln. And I know Uncle Tom's Cabin.

[D]

Well, you. You chose good company, boy, but not much help in getting you admitted. Do you have a trade?

[E]

What does this mean, trade?

[C]

Well, have you ever worked at anything.

[D]

Such as farming, carpentry, stonemason, shoemaker, a tailor?

[E]

No, nothing. But I will learn. This is what brings me to America to learn.

[D]

5 cents to your name. No relatives, no friends and no skills. You're a very poor risk.

[E]

Risk? What. What is this risk?

[D]

It's.

[C]

Oh, well, forget it.

[D]

I'll make an exception in your case. Okay, go ahead. Michael Pepin was permitted to enter America to keep alive. He did farm work in Maryland, tended mules in Delaware, painted basements in Philadelphia, and finally found employment in a cracker factory in New York. In the factory, he made friends with a boiler room engineer who took an interest in the young. That's enough.

[B]

Cold, boy. Shut the door. Sit yourself down and rest. You still want to be A fireman when you grow up, Michael?

[E]

Oh, yes, A boiler fireman like you, Mr. Jim.

[B]

No, no, no, my lad. You must aim higher, much higher. That takes book learning. Here, I brought you a present. It's secondhand, but it's still good.

[E]

Oh, a book. Oh, thank you, Mr. Jim.

[B]

It's a dictionary. The first thing you gotta do is learn English. Every time you come across a new word that you don't understand, you just look it up in this book.

[E]

I will look it up, yes.

[B]

Next, you must go to school.

[E]

That is my dream.

[B]

A cousin of mine goes to Cooper Union night school. I'll talk to him, see about getting you into classes.

[E]

Oh, thank you, Mr. Jima. I wish to learn very much.

[B]

That's the right idea. Boy, this is a growing country. There's opportunity all over this land. Study, go to school. Prepare yourself for when your chance comes.

[D]

The boiler engineer, true to his word, got young for being admitted to school. Every spare moment at work, he made his young pupil memorize famous personalities and documents in American history.

[E]

For the people shall not perish from this earth.

[B]

Very good, Michael. Very good.

[E]

I am speaking English. Better?

[B]

Yes, much better. Tomorrow we'll try my favorite poem, the the village blacksmith.

[E]

Mr. Jim.

[D]

Yes, Michael?

[E]

In the library at school is a big picture with many fine looking men. Some sit and some stand.

[B]

What about it?

[E]

These men, who are they? Names like McCormick, Morse.

[B]

How.

[E]

Whitney, Morton. Mr. Jim. What did these men do?

[B]

Well, let's see. Morse invented the telegraph. McCormick, the reaper.

[D]

How.

[B]

The sewing machine. Most of these names belong to inventors, men of science.

[E]

Like Benjamin Franklin and his kite.

[B]

That's right. Like Franklin.

[E]

This is what I wish to become. A man of science. Like these men in the picture.

[D]

Soon, Michael Pepin was just that, a man of Science. At 21, he entered Columbia College, winning the coveted Tyndall Fellowship for advanced study at Cambridge. Abroad, he became fascinated by the Faraday Maxwell electromagnetic theory. After a year at Cambridge, he transferred to the University of Berlin to complete his doctorate under the famous German physicist von Helmholtz. On his return to America in 1889, Dr. Poupin was assigned to teach mathematical physics in the new department of electrical engineering at Columbia. With his assistant, Crocker, the two men went to examine their new quarters. Well, Crocker, what do you think of our new home? The truth.

[F]

Naturally, the truth.

[C]

It looks like a cow shed.

[F]

Yes, it isn't very large. Nor is our laboratory too well equipped. One motor, one dynamo, an alternator and some measuring instruments.

[C]

And two green instructors.

[F]

We will expand Crocker it's up to us to expand if we want to make any impression upon the electrical art.

[C]

Oh, we'll expand, Professor.

[B]

Be sure of that.

[F]

What makes you so confident?

[C]

You have no idea how rapidly an inexperienced teacher expands when he tries to teach a new subject to pupils who are poorly prepared.

[D]

The basic theoretical courses in electrical engineering were taught by Dr. Poupin in the morning. In the afternoon, he gave laboratory instruction. In the evening, working in the cowshed, he found time to carry on experimental research. And from this came Michael Poppin, the inventor. All of us know today that it's a simple thing to tune a radio just by twisting a dial or pushing a button. We get music, drama, sports, like magic. But when wireless or radio first came into being, this magic was unknown. A big problem was how to send and receive messages so they would not interfere with one another. This problem was solved by Michael Puppin.

[F]

In an electrical circuit having a coil and condenser. The moving electricity has a definite inertia and a definite electrical stiffness. Hence it will have a definite pitch or frequency, just like a tuning fork or more even a vibrating knife stuck into the hard ground. It is obvious, therefore, that an electrical resonator, the pitch of which can be changed by adjusting its coil or condenser or both, is a perfect parallel to the acoustical resonator. I call my invention selective tuning.

[D]

Electrical tuning was not the only invention of the immigrant inventor. He perfected a type of telephone repeater or induction coil which first made possible long distance telephony.

[F]

The electrical vibrations in a telephone line can be likened to the simple mechanical motions in a vibrating string. Small weights placed along the string at several intervals of the wavelength will enable the desired frequencies to be transmitted much more efficiently than otherwise. So it is with the telephone line. Localized induction coils placed at predetermined intervals in the line will maintain the desired tone, distinctions and power of signal.

[D]

Michael Pepin was indeed a versatile man of science. He discovered secondary X ray radiation and made a long list of contributions to the wide field of telegraph, telephone and wireless communication. And honors and prizes came to the immigrant inventor.

[B]

The Elliott Cresson Medal for distinction in physics.

[D]

The presidency of the Institute of Radio Engineers.

[C]

The Edison Medal. The Ibert Prize of the French Academy.

[B]

The presidency of the New York Academy of Science.

[D]

18 honorary DEGR scientist inspiring Teacher inventor. Such was the career of Michael Puppin, the one time Serbian shepherd boy who made of his opportunities in a free land and inspiring adventure in research. And that's today's adventures in research, produced in cooperation with the Westinghouse Research Laboratories. These programs are broadcast to armed forces personnel overseas through the facilities of the Armed Forces Radio Service. Join us again next week for another transcribed story of science on Adventures in Research.

[B]

RA.