@Comment 1833.bib -*- mode: BibTeX -*- 

@article{wheatstone33_figur_obtain_by_strew_sand_,
 title        = {On the Figures Obtained By Strewing Sand on Vibrating Surfaces, Commonly Called Acoustic Figures},
 author       = {Wheatstone, C.},
 year         = {1833},
 tags         = {__image, sand, sound},
 journal      = {Proceedings of the Royal Society of London, Philosophical Transactions of the Royal Society},
 pdf_locked   = {False},
 url          = {https://archive.org/details/philtrans07365800},
 file         = {1800/1830/1833/Wheatstone/Wheatstone_1833_On_the_Figures_Obtained_By_Strewing_Sand.pdf},
}