In February 1903 he was asked to give a brief account of the hydrodynamical principles of seiches, with suggestions to surveyors regarding the observations they might make on Scottish lakes in the Scottish Lake Survey. Seiches are oscillations in the water level occurring in lakes and along sea coasts. Chrystal published three major papers on the subject in 1904, 1905 and 1906 which were all published by the Royal Society of Edinburgh .
Noong Pebrero 1903 siya ay hingin sa iyo na magbigay ng isang maikling account ng hydrodynamical prinsipyo ng seiches, na may mga suhestiyon sa surveyors tungkol sa obserbasyon nila maaaring gawin sa Scottish Guimaras sa Scottish Lake Survey. Seiches ay oscillations sa antas ng tubig nangyari sa Guimaras at kasama dagat coasts. Chrystal-publish ng tatlong pangunahing mga papeles sa ang paksa sa 1904, 1905 at 1906 na kung saan ang lahat ay nai-publish sa pamamagitan ng Royal Society ng Edinburgh.