Booklet "The Electric Spark" by William Otis Sawtelle. Reprint from the Astrophysical Journal, Vol. XLII, No.2 September 1915
From collection Islesford Historical Society Collection
Booklet "The Electric Spark" by William Otis Sawtelle. Reprint from the Astrophysical Journal, Vol. XLII, No.2 September 1915
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