LIII.Some properties of porous building materials.—VI.An autographic apparatus for measuring rates of flow of water

Abstract

He and least in tyt)e 6 filled with Ar. (Of course B can give no information about the absolute value of/3 for either cathode, since it is possible, indeed probable, that/3 may be comparable with t even for the K cathode.) It so happens that this is also the order of the L.F. time-lags estimated from either the frequency-response curves or the pendulum curves. We are not disposed to insist on this difference ; we mention it merely as suggestive of the direction in which further investigation might be fi'uitful.