Ford Model T Ignition Coil: a Spark of Genius

Our Own Devices October 3, 2025
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Our Own Devices

@canadianmacgyver

About

Ever wonder how a rotary telephone works, how sailors and pilots navigated by the stars, or how mechanical calculators perform complex math using only gears? Then you've come to the right place! Our Own Devices is a channel dedicated to the fascinating world of vintage technology, and the many elegant and ingenious ways our ancestors solved even the most complex technical problems. Want more fascinating history? I am a regular staff writer for Today I Found Out and many of its sister channels: https://www.youtube.com/@TodayIFoundOut I also have a historical adventure novel titled 'Our Own Devices' set in 1920s Morocco. Check it out at my personal website: www.gillesmessier.ca And finally, I make 1920s/30s-style Art Deco posters, which you can purchase on my Etsy store: https://www.etsy.com/ca/shop/DecoEchoes

Video Description

[ERRATUM: I accidentally misspoke and stated that the "D" in DELCO stood for DETROIT rather than DAYTON] Early Ford vehicles from the Model A (1903) through the Model T (1908-1927) used an electrical ignition system based on "trembler" coils, high-voltage, high-frequency transformers adapted from the classic induction or Ruhmkorff coil. But while effective, this system struggled to achieve accurate ignition timing and was eventually replaced by the more reliable DELCO ignition coil system. Medical Coils video: https://youtu.be/NufNhuWI1iA Pocket Battery No.1 video: https://youtu.be/RCANKMhbGjw 0:00 Introduction 0:46 Non-Electrical Ignition 1:55 Ford Make-and-Break System 3:22 Trembler Coil Overview 4:11 Induction Coil Theory 7:17 Commutator/Distributor 7:52 Trembler Coil Box 8:24 Electrical System Evolution 9:57 Trembler Coil Shortcomings 11:07 Master-Slave Coil Systems 11:28 Joseph Williams Improvements 12:36 DELCO Ignition System 14:27 Other Ignition System 15:28 Ford Trembler Coil Evolution 19:15 Outro SOURCES http://www.aeroelectric.com/Reference_Docs/Books/Model_T_Ignition_System.pdf https://www.history.com/this-day-in-history/august-29/charles-f-kettering-inventor-of-electric-self-starter-is-born https://www.denso-am.eu/news/deneur21_04_ignition-coil-basic-principles https://www.hotrod.com/how-to/inductive-vs-capacitive-discharge-ignition-systems#google_vignette https://www.curbsideclassic.com/automotive-histories/automotive-history-the-history-of-electronic-ignition-losing-the-points-part-1/ https://patents.google.com/patent/US1223180A/en https://www.modeltcentral.com/Model-T-Ford-Electrical-Specifications.html https://www.larescorp.com/toolbox/skinned-knuckles-articles/the-model-t-ford-buzz-coil/ https://www.larescorp.com/toolbox/skinned-knuckles-articles/the-model-t-ford-buzz-coil/

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