Hertz, Heinrich, 1857-1894. [Letter to George F. FitzGerald from H. Hertz], 12th December 1891. - 1 22 x 13 cm. sheet (folded) ; Signature missing, identified by handwriting. Subjects--Personal Names: Hertz, Heinrich, 1857-1894 --Correspondence. Subjects--Topical Terms: Electromagnetism.