I've just run into a website with some autobiographical material by Essen which covers the developments that originally brought leap seconds into being:
http://www.btinternet.com/~time.lord/index.html -- Steve Allen UCO/Lick Observatory Santa Cruz, CA 95064 [EMAIL PROTECTED] Voice: +1 831 459 3046 http://www.ucolick.org/~sla PGP: 1024/E46978C5 F6 78 D1 10 62 94 8F 2E 49 89 0E FE 26 B4 14 93