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XIV.—An Investigation of the Seiches of Loch Earn by the Scottish Lake Survey Part I.: Limnographic Instruments and Methods of Observation. Part II.: Preliminary Limnographic Observations on Loch Earn

Published online by Cambridge University Press:  06 July 2012

G. Chrystal  and
James Murray
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Extract

In this communication some account is given of the various instruments used in the survey of the seiches of Loch Earn, of the methods of observing, and of the reduction of the results of observation.

In Part II., which immediately follows, Mr James Murray gives an account of the preliminary survey, of which he had charge. Later, a summary will be submitted to the Society of the results as regards the periods and nodes of the lake; and finally, an account will be rendered of the observations made in order to connect the occurrence of seiches with other atmospheric phenomena.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 45 , Issue 2 , 1907 , pp. 361 - 396
Copyright
Copyright © Royal Society of Edinburgh 1907

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References

page 364 note * The apparent anomaly may have been due to capillary action on the zinc float. In the fixed limnographs of Forel and Plantamour, the float was surrounded by a band of cloth, so as to be constantly wetted by the water. In my instrument as used on Loch Earn, this precaution was not taken.

page 364 note † Red would have been much better for subsequent photographic reproduction of the limnograms.

page 365 note * Part II. of this series.

page 367 note * If preferred, a steel band could be used, by turning the rims of the two pulleys flat.

page 372 note * “Die Seiches des Waginger-Tachingersees,” von Anton Endrös: Sitt. ber. d. Kgl. Bayer. Akad. d. Wiss., Bd. xxxv., 1905, p. 447Google Scholar.

page 373 note * These were established by observations with the statolimnograph, and will be discussed in a later paper of this series.

page 375 note * Phil. Trans. Roy. Soc. Lond., 1883.

page 375 note † It should be noticed that this is not the critical velocity (u c=13000v/d) at which turbulent motion begins. The critical velocity u c at which the resistance begins to be proportional to (velocity)n, where n is a number varying from, say, 1·72 to 2·00, is again different, viz., u c=1·325u c.

page 379 note * Or even when there is a small regular seiche giving a smooth limnogram.

page 385 note * Points of symmetry, of course, if such are available.

page 386 note * It was mounted on friction wheels, and magnified the seiche about four and a half times. Time-scale of limnogram, ·2 inch per minute.