AbstractsPhysics

Typewritten MS. Comparisons 1ith the National Bureau of Standards at Washington, D.C. in January, 1948, have indicated that a reference mean of electromotive force can be recaptured even after a period of forty years to within twenty microvolts. This has been accomplished with unexpectedly high precision by application of a previously established ageing correction to the mean electromotive force of a small number of old cells. Confirmation is provided, of the validity of the ageing correction which is of the form: EM, = A + B'log (M + T), where A, B, and T are constants, and M is the age of the reference cells.