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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