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Ayrton, W.E.; Perry, J.; Sumpner, W.E.

Quadrant Electrometers

First Edition. 8vo, paged [53]-58; gray cover with black print, peripheral tanning, tears at top corners and bottom left corner, tears along spine edge, upper right corner bumped and creased throughout, light spotting; interior clean but for light spotting; "From the Proceedings of the Royal Society, Vol. 50"; "Received May 19, 1891." More

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1293258
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Ayrton, W.E.; Sumpner, W.E.

Alternate Current and Potential Difference Analogies in the Methods of Measuring Power

First Edition. 8vo, paged [204]-215, illustrated; G-; housed in clear plastic envelope, tan cover with black print, front detached from spine, peripheral tanning, chipping at all edges, light spotting, back cover torn from spine at top and bottom, chipped edges, light spotting; interior clean; "From the Philosophical Magazine for August 1891." More