Denshin Denrei Denwa
Electric Bells and Telephones ／ Electrical Telegraphy ／ Electrical Telegraphy, Electric Bells and Telephones ／ 電信 電鈴 電話Description
By wrapping copper wire around an iron rod and connecting it to a battery, an electromagnet is created. This educational film blends live‑action footage with animation to explain how electromagnetism underpins the principles and structures of electric bells and telephones.
