The Philosophical magazine; a journal of theoretical, experimental and applied physics (1798)
London Taylor & Francis (etc.) · leaf 454
ords which pass over two other larger pulleys; these are ofwood ; they are both 15 centimetres in diameter, and are fixedupon a common axis, which is furnished with a small handle.Lastly, the cords are arranged so that the two brass pul-leys, and consequently the two discs, turn in the same… … 071 the Permanetice of Impressions on the JRetiyia. ^So conveniently placed behind the coloured disc; lastly, the ob-server must also place himself on the other side of the appa-ratus, that is to say, opposite to the black disc, keeping hiseyes on a level with the centres of the discs, whilst…
Physics
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