Fig 1.
Hand written note from Dr. Stratton at bottom of letter from Dr. Glazebrook of the National Physical Laboratory (Great Britain).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.