Morse Code: Vail's Type Count, the Operator's Fist, and Denton's Blinks

SPEAKER_1 (0:00)

So it's July 12th, 1999, and the United States is transmitting its very last commercial message in Morse code. And the message they actually sent out into the ether was the exact same phrase that Samuel Morse sent way back in 1844 to debut the entire system.

SPEAKER_2 (0:18)

Right, the famous phrase, what hath God wrought?

SPEAKER_1 (0:20)

Exactly.

SPEAKER_2 (0:20)

Right.

SPEAKER_1 (0:21)

What hath God wrought? And that was immediately followed by the prosign SK, which in the code means end of contact.

I just think that is such an incredibly dramatic way to officially close out an era.

SPEAKER_2 (0:34)

Oh, it truly is a poignant bookend. And you know, they really weren't the only ones to sign off with that kind of gravity. When the French Navy stopped their official use of the code a couple of years before that, I think it was January of 97, their final transmission read, calling all, this is our last call before our eternal silence.

SPEAKER_1 (0:55)

Wow. Eternal silence.

I mean, that literally gives you chills.

SPEAKER_2 (1:00)

It really does.

SPEAKER_1 (1:00)

But if you are listening to this deep dive today, you're about to discover why that silence never actually arrived. Because today we are looking at the surprisingly resilient, like 160 plus year history of Morse code.

SPEAKER_2 (1:16)

Yeah, it's a fascinating survival story.

SPEAKER_1 (1:18)

It really is.

And to figure this out, we've pulled from a massive stack of sources today. We're talking 19th century telegraphy patents, military communication logs, all the way up to modern neurobiology papers on auditory learning. So our mission today is to unpack how this seemingly primitive system of electrical pulses actually became the world's first true digital language.

SPEAKER_2 (1:41)

Right. And we're tracking how it managed to outlast the very commercial telegraph systems that it was built to serve in the first place. I mean, it is this incredible journey of evolution. It moves from these physical marks indented on a paper tape to an auditory language and then eventually finding this second life as a vital modern day assistive technology.

SPEAKER_1 (2:01)

Because I think we so often just picture this as, you know, an old fashioned cinematic way to tap out an SOS on a sinking ship.

SPEAKER_2 (2:08)

Oh, totally. The Titanic movie image.

SPEAKER_1 (2:11)

Right. But when you really look at the actual mechanisms involved, it represents this incredible intersection of human biology, electrical engineering, and linguistics.

So to really grasp how revolutionary this was, I think we have to look at the massive bottleneck that inventors were facing back in the 1830s.

SPEAKER_2 (2:30)

Yeah, you have to put yourself in their shoes.

SPEAKER_1 (2:32)

Exactly. So you have Samuel Morse, the physicist Joseph Henry and an engineer named Alfred Vail. And they are developing an electrical telegraph. They have a wire and they know they can send an electrical pulse down that wire.

But they need a way to translate natural complex human language into a system that only knows two states, you know, on or off.

SPEAKER_2 (2:55)

And their initial approach to that binary constraint was just terribly inefficient.

SPEAKER_1 (3:00)

How so?

SPEAKER_2 (3:01)

Well, Samuel Morse originally only wanted to transmit numerals over the wire, not letters, just numbers. And the concept relied on operators at both ends having these massive, incredibly heavy code books.

SPEAKER_1 (3:12)

Oh no, that sounds awful.

SPEAKER_2 (3:13)

It was. So if I wanted to send you a message, I would basically transmit a string of numbers. You would receive those numbers, physically open your big book, find, you know, page 74, look down to word 12, and see that the number meant the word ship.

SPEAKER_1 (3:29)

That sounds like trying to text someone using a library index. I mean, the cognitive load of constantly looking up numbers just to build a single sentence would be agonizing.

SPEAKER_2 (3:39)

Yeah, it would have crippled the speed of communication before it even began. You just couldn't have a real time conversation.

And this is where Alfred Vail steps in with a much, much better idea. He realizes they need to be able to send individual letters, not just coded numbers. So he defies to assign combinations of short and long pulses to the alphabet. But what's really fascinating here is his actual methodology for assigning those codes. He doesn't just do it alphabetically, like A is one dot, B is two dots.

SPEAKER_1 (4:08)

Right, that would be too simple.

SPEAKER_2 (4:09)

Yeah, he goes down to a local newspaper in Morristown, New Jersey, and he literally counts the movable metal type in the printer's type cases.

SPEAKER_1 (4:18)

Wait, he goes to a printing press? Oh, I see, because the printers would naturally have more metal blocks for the letters they use most frequently.