First Edition. 8vo, paged -390, tables; G-; brown cover with black print, ink inscription at upper right corner "Compliments of R.H. Adams", mild creasing along spine edge and outside edge, bumped corners, slight spotting, back cover has blue library stamp at top left corner; interior pages slightly worn with mild creasing, pen and pencil notation on p. 385; "Reprinted form Journal of the Washington Academy of Sciences, Vol. 21, No. 16, pp. 381-390, 1931"; "Papers from the Geophysical Laboratory, Carnegie Institution of Washington, No. 772."
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