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Feb 27, 2026

post

Feb 27 6:25 PM #54 4 min

The Sounder Learned to Hold a Pitch

Harmonic Telegraph Key Restoration

Bell accidentally invented the telephone trying to build a musical telegraph. I'm finishing his original project.

code-a-day

Feb 27 1970s
RubyC

The Wire That Learned to Listen Selectively

Bandpass Filtering 🔗 Harmonic Telegraph Key Restoration

Bell's harmonic telegraph worked because tuned reeds ignored every frequency but their own.

signal-processingfilteringtelecommunicationsdsp

game