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RICHARD A. BETH - INSCRIBED PICTURE POSTCARD SIGNED - HFSID 182086

Postcard Photograph inscribed and signed: "For William W. Stanhope/from Richard A. Beth" and, on verso: "For. William W. Stanhope/Best wishes/Richard A. Beth/[Taken Oct 2, 1971 in/Princeton, Mass/by Robert S. Sauer]". B/w, 5¼x3¼.

Sale Price $170.00

Reg. $200.00

Condition: Fine condition Add to watchlist:
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RICHARD A. BETH. Postcard Photograph inscribed and signed: "For William W. Stanhope/from Richard A. Beth" and, on verso: "For. William W. Stanhope/Best wishes/Richard A. Beth/[Taken Oct 2, 1971 in/Princeton, Mass/by Robert S. Sauer]". B/w, 5¼x3¼. The optical torque due to polarized light was first measured in 1936 by Richard A. Beth. In his experiment, circularly polarized light was passed through a quartz wave plate suspended by a torsion fiber, and the tiny reaction torque on the plate due to the polarization change of the emergent light was measured. Fine condition.

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