Paper, 'Experiments for investigating the cause of the coloured concentric rings discovered by Sir I [Isaac] Newton between two object glasses laid upon one another' by William Herschel 42 pages of manuscript paper and one page of 13 figures showing arrangements of lenses and glasses. Subject: Physics Published in Philosophical Transactions as 'Experiments for investigating the cause of the coloured concentric rings, discovered by Sir Isaac Newton, between two object-glasses laid upon one another'. Read 15 February 1807. Abstract published in Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London [later Proceedings of the Royal Society of London], Volume 1, 1832. [1807]