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XXX.—On the Theory of the Leaking Microbarograph; and on some Observations made with a Triad of Dines-Shaw Instruments.

Published online by Cambridge University Press:  15 September 2014

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Extract

THE minor fluctuations of the atmospheric pressure are now engaging the close attention of meteorologists, and my own attention has been drawn to them on account of their connection with the oscillations of lake-surfaces generally known since Forel's investigations under the name of seiches.

As these fluctuations often do not exceed a millimetre or two of water, they are not shown by the ordinary self-registering apparatus. In order to record them we may use a specially sensitive form of barograph, such as the Richard statoscope, which is delicate enough to show these small fluctuations, and yet can be brought back to a momentary zero whenever the indicator threatens to go off the scale or beyond the limits of safety. There are, however, two objections to this method of measurement.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 28 , 1908 , pp. 437 - 460
Copyright
Copyright © Royal Society of Edinburgh 1908

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References

page 438 note * Trans. Roy. Soc. Edin., vol. xliv. p. 373 (1906).

page 438 note † See Quart. Journ. Roy. Met. Soc., vol. xxxi. p. 39 (1905).

page 440 note * This part of the theory will apply equally well to any other form of microbarograph in which the reading is proportional to the difference between the atmospheric pressure and the pressure in an air-chamber provided with a leak: for example, to the Richard statoscope, when its air-chamber communicates with the outer air through a capillary tube.

page 441 note * The exact equation (3) can be reduced to the form and could be used instead of the approximate one; but the calculations are much more complicated.

page 442 note * Quart. Journ. Roy. Met. Soc., xxxi., p. 43 (1905).

page 442 note * This figure and the corresponding ones which follow are not drawn to scale, but are diagrammatic merely.

page 450 note * See my Algebra, ii., ch. xxix., § 29.

page 458 note * A comparison of the traces of the microbarograph and statoscope is interesting, as it shows what proportion of the drop in the microbarogram is real and not merely apparent, as suggested by fig. 6 above. The statoscope, of course, shows no false depression, as it was not worked with a leak.