Hutchinson, W. C. A.

English

The charge (Q) and radius (a) of single rain drops arriving at the earth’s surface have been measured, using a valve amplifier with photographic recording in conjunction with the absorbent paper method for measuring drop radius. The earth’s field (F) and point discharge (I) were also measured. The sign of charge and field were usually opposite. On one day when there was no point discharge the results could be represented by q α – (F+500) where q is the average charge per c.c. and F is in Volts/metre. When there was point discharge the measurements could be represented by Q/I α a or rather by Q/I α a(^2)/V whre Q/I has been averaged for different values of a and V is the terminal velocity of a drop of radius a. It is suggested the connexion between Q/I and a(^2)/V is accounted for by Wilson’s theory of the selective capture of ions by falling water drops. The point discharge current was sometimes observed to lag behind the field at the earth when the field was changing sign

Hutchinson, Walter Charles Andrew

Durham e-Theses

Durham E-ThesesThe electric charges and masses of rain dropsHutchinson, Walter Charles AndrewHow to cite:Hutchinson, Walter Charles Andrew (1949) The electric charges and masses of rain drops, Durham theses,Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/9043/Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission orcharge, for personal research or study, educational, or not-for-proﬁt purposes provided that:• a full bibliographic reference is made to the original source• a link is made to the metadata record in Durham E-Theses• the full-text is not changed in any wayThe full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full Durham E-Theses policy for further details.Academic Support Oﬃce, Durham University, University Oﬃce, Old Elvet, Durham DH1 3HPe-mail: e-theses.admin@dur.ac.uk Tel: +44 0191 334 6107http://etheses.dur.ac.uk

The electric charges and masses of rain drops

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The electric charges and masses of rain drops

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