On a Form of Galvanometer Suitable for the Quantitative Measurement of the Electomotive Force, and Internal Resistance of Telegraph Batteries [signed]

First Edition. Softcover. 8vo., 5 pages, paged [217]-221, 1 plate, illustrated; G-; blue cover with ink inscription "W.E. Aryton, Testing Galvanometer", some smudging and spotting, small tears along lower edge and at top and bottom of spine, curled lower corner, bumped upper corners, center creased throughout, stray ink marking at top of back cover; ink inscription inside front cover "Prof. G. Carey Foster, With kind regards from the Author, 50 Kensington Gardens Square, London W., Dec. 8th"; slight foxing on interior pages, smudging along upper edges, text clean; "From the Proceedings of the Asiatic Society of Bengal for September, 1871, p. 217" 1291849. Rockville Non-Retail Listings. (Inventory #: 1291849)