First Edition. 8vo, paged 230]-235, illustrated; G-; brown cover with black print, ink inscription at top edge, all corners bumped, mild creasing throughout, short tear to center of right edge throughout, pencil notation center, slight smudging/spotting, back cover has small tear to left edge; clean interior; "Reprinted from The Review of Scientific Instruments, Vol. 8, No. 7, pp. 230-235, July, 1937"; "Papers from the Geophysical Laboratory, Carnegie Institution of Washington, No. 934."
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