26110. na. THOUGH BLIND, HIS BEACONS LIGHT THE SEAS. The Mentor. April 1927
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26110. na. THOUGH BLIND, HIS BEACONS LIGHT THE SEAS. The Mentor. April 1927
- na. THOUGH BLIND, HIS BEACONS LIGHT THE SEAS. The Mentor. April 1927. 2p. Disbound. Dr. Gustav Niels Dalen, though blond, perfected his invention the lighthouse “sun valve” and won for himself the Nobel Prize. This AGA mechanism is known by numerous seamen and allows remote or perilous areas to be equipped with beacons turned on and off by the sun’s light. Article includes much information about this Swedish inventor including a large full page image of the inventor posing beside a lighthouse lens equipped with his mechanism. (VG). $28.