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It is hardly necessary to remind the Fellows that the self-recording instruments employed by the Meteorological Committee at their Observatories for the continuous registration of pressure and temperature furnish their results in the form of photographic traces. The usual method of dealing with these barograms and thermograms, as they are respectively called, is to measure them at certain intervals by appropriate scales, and to treat the numerical values so obtained by arithmetical processes so as to arrive at mean results. This method is naturally very laborious, and its accuracy is to some extent affected by certain peculiarities found to be very commonly present in such photographic curves, and of which no satisfactory explana­tion has as yet been discovered. The most important of these is what is termed by us “bagging,” the result of which is that the base or fiducial line of the curve is no longer a straight line, but exhibits a certain de­gree of curvature, so that the difficulty of determining the hourly or other values by means of an engraved scale, bearing parallel straight lines, is very considerable.

XVII. On the employment of a planimeter to obtain mean values from the traces of continuously self-recording meteorological instruments