Burns and Ripple [10] chose 10 h at 1300°C as the high-temperature anneal (BWA) for both Pt and Pd. After such an anneal the emf in Pt is more stable than in Pd. The measured emf at the Ag point (,-~961°C) of seven samples of annealed Pd increased when given a further uniform anneal at ll00°C [10]. The average increase was about 0.55 lxV for the first 100 h of anneal, and the variation in drift rate among the seven samples was ___ 50%. By comparison, there was "no evi- dence of thermoelectric drift" in the emf of Pt under these conditions. An aspect of annealing that needs consideration is the temperature uniformity required along a thermoelement to achieve a uniform annealing effect, i.e. to maintain or produce homogeneity. In one study [2], the annealing of Au samples for 10 h at 900°C produced a change in Seebeck emf at the Sb point that differed by < 0.2 IxV from that obtained by annealing at 1000°C. Similarly, the annealing of Pt at 1150°C, 1300°C or 1450°C for