Overview
Johann Philipp Reis (1834–1874) built an apparatus in 1861 that transmitted musical tones electrically, and demonstrated it publicly to the Physical Society of Frankfurt. He called it the Telephon. Whether it could carry intelligible speech is disputed and was disputed at the time. He died of tuberculosis at 40, two years before Bell's patent.
What You Need
- Lived: 1834–1874, Germany
- Anchor year: 1861 — the Telephon demonstrated
- Strand: overlooked — a contested precursor
Steps
The problem as it stood
The telegraph could send discrete symbols. Sending a continuously varying signal — sound — required a transducer converting acoustic pressure into a proportionally varying electrical quantity, and no accepted way of doing that existed.
What he actually did
Reis built a transmitter using a membrane with a contact that made and broke a circuit as it vibrated, and a receiver in which a coil around an iron rod produced sound by magnetostriction. He demonstrated it publicly and distributed instruments to other researchers.
How it worked
This is the crux of the dispute. A make-and-break contact is fundamentally a switch, so the device transmits frequency well and amplitude poorly — excellent for musical tones, marginal for speech. Later experimenters found that a slightly maladjusted Reis transmitter can behave as a loose imperfect contact and pass recognisable speech. Bell's variable-resistance transmitter varies continuously by design rather than by accident.
What it made possible
Reis instruments circulated among European physicists through the 1860s, establishing that electrical sound transmission was a live research problem. His work was cited in later telephone patent litigation, where the question of whether his apparatus transmitted speech was argued at length.
What happened to him
He remained a schoolteacher, was not taken seriously by much of the German scientific establishment, and died of tuberculosis in 1874 at 40 — two years before Bell filed.
Where the credit landed
Reis built and publicly demonstrated electrical transmission of musical tones in 1861, and whether his apparatus transmitted intelligible speech is genuinely contested rather than settled either way. German accounts have tended to claim him as the telephone's inventor and Anglophone accounts to dismiss him. The defensible position is narrower: he demonstrated electrical sound transmission first, and Bell built the first device designed to carry speech reliably.
Pro Tips
- A make-and-break contact transmits pitch well and loudness badly — that is the whole dispute.
- His instruments circulated widely, so the idea was not obscure when Bell worked.
- Neither the strong German claim nor the flat Anglophone dismissal survives scrutiny.
Knowledge Base
What You'll Learn
The telephone dispute is a good rehearsal for every priority dispute that follows.
Why "did it transmit speech" is hard to answer
The question is not purely historical. Surviving and reconstructed Reis instruments behave differently depending on contact adjustment; some pass recognisable speech, especially when imperfectly set. So the honest answer is that it could sometimes, unreliably, and not by design. Bell built a transmitter whose operating principle produces a continuously varying current, which is why his worked consistently.
Where This Fits
This guide covers one specific part of the history of media technology. The wider picture — how each link in the chain from capture through transmission to display was actually built, who built it, and why the credit so often landed somewhere else — is in A History of Broadcast Technology: The Chain From Capture to Screen, which frames the discipline as a whole and links out to the detailed guides underneath it, including this one. If you are starting from scratch rather than solving a specific problem, read that first and come back here.
FAQ
Q: Did Philipp Reis invent the telephone?
A: He built and publicly demonstrated electrical transmission of musical tones in 1861, fifteen years before Bell's patent. Whether his apparatus transmitted intelligible speech is contested. He demonstrated electrical sound transmission first; Bell built the first device designed to carry speech reliably.
Q: What is the difference between his transmitter and Bell's?
A: Reis used a make-and-break contact, which conveys frequency well but amplitude poorly. Bell used variable resistance, in which the current varies continuously with sound pressure — which is what speech requires.