Appendix, 'On the forms and state assumed by fluids in contact with vibrating elastic surfaces' by M [Michael] Faraday Appendix to Faraday's paper, found at PT/19/3. Subject: Physics Published in volume 121 of Philosophical Transactions as part of paper titled 'On a peculiar class of acoustical figures; and on certain forms assumed by groups of particles upon vibrating elastic surfaces'. Written by Faraday at the Royal Institution. 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 3, 1837. 30 July 1831