1. G. C. Straty and E. D. Adams, Rev. Sci. Instrum. 40, 1393 (1969).RSINAK0034-6748
2. Servometer Corp., Cedar Grove, N.J.
3. Emerson and Cuming, Inc., Canton, Mass., Type 2850FT.
4. NbTi wire with copper clading, 0.0076‐cm diameter.
5. Emerson and Cuming, Inc., Canton, Mass., Type 1266.