SEICHES AND OTHER OSCILLATIONS 
31 
self-registering limnograph installed at Morges, and a portable limno- 
graph of simpler construction. In 1877 Plantamour established a 
magnificent self-registering limnograph at his villa at Secheron, near 
Geneva, which has been in continuous operation since. In 1879 
Sarasin devised his portable limnograph, with which observations were 
made at Tour de Peilz, Chillon, Rolle, and various other stations on 
Leman, and also upon other Swiss lakes. In 1880 the French 
Government engineers also installed a fixed limnograph at Thonon, 
with which observations have been made under the superintendence 
of Delebecque, Du Boys, and Lauriol. 
During the last twenty years a large number of enthusiastic 
observers have followed the lead given by Forel and his fellow- 
countrymen ; and we have now a great mass of information regarding 
the seiches in lakes in various parts of the world,^ from the 15-hour 
seiches observed by Henry in Lake Erie, which is 396 km. long, to 
the seiches of 1 4 seconds observed by Endros in a small pond whose 
length was only 111 m. 
Systematic observation of seiches in the lakes of Scotland is of 
very recent origin. On S2nd May 1902, Dr Johnston and the late 
Mr J. Parsons, using merely a foot-rule, made a determination of the 
uninodal period of Loch Treig. In the same year Mr James Murray 
made similar determinations for Lochs Laggan, Arkaig, Morar, Fada, 
Maree, and Chroisg, and Mr J. Hewitt for Lochs Shiel and More. 
Mr Murray also detected the binodal seiche of Lochan Fada, and in 
1903 Mr T. R. H. Garrett obtained a good approximation to the 
uninodal period of Loch Ness. All these observations were made 
with a foot-rule, and make no pretence to great accuracy. The 
uninodal periods found, some of which are given in the table below 
on p. 53, varied from 9 min. for Loch Treig to 31 min. for Loch Ness, 
and the ranges from 0*38 cm. to 3*7 cm. 
In June 1903 a self-recording Sarasin limnograph was erected at 
Fort Augustus under the superintendence of Mr E. M. Wedderburn, 
who was afterwards assisted in the observations by Messrs James 
Murray and E. R. Watson. In May 1904 a Dines-Shaw microbaro- 
graph, provided by the Moray Fund of the University of Edinburgh, 
was set up alongside of this limnograph. The observations were 
continued till May 1905, the instruments having been in the charge 
of the monks of the Order of St Benedict from October 1904 to May 
1905. This valuable series of observations has not as yet been 
exhaustively discussed, but Mr Wedderburn has deduced from them 
^ See the extension of Forel's bibUography appended to my j)aper on the 
Hydrodynamical Theory of Seiches, Trans. Roy. ISoc. Edi-n., vol. xh. p. 599, 1905 ; 
also, for the most recent information, an excellent paper by Halbfass, " Der 
heutige Stand der Seiches-Forschung," Zeitschr. Ges. Erdk. Berlin., 1907, p. 6. 
