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Boy's "air adventure" book, not very technical or authoritative, but clearly predates most sources:
Dave Dashaway, Air Champion: Or Wizard-Work in the Clouds, 1915
"....within the full view of every person on the ground, distinctly the Ariel began “writing.” “A-R-I-E-L”–in small letter script; every curve and letter formation could be traced." PRR (talk) 00:20, 23 May 2023 (UTC)[reply]
