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I THOUGHT it might be welcome to some of your readers to be made acquainted with the following simple and cheap instruments which I have now used for some years with advantage in lectures, and also ...

HAVING already described my absolute sine electrometer before the Physical Society and at this year's meeting of the British Association, there is no necessity for describing here more than the ...

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...