Before the advent of electronic distance measuring instruments, surveyors used tapes made of an alloy called "invar," to measure base lines.
High resolution available. (386.9 kb, 1388x888).
With the NOAA 200th Celebration coming to a close at the end of 2007, maintenance of this Web site ceased. Updates to the site are no longer being made.
Before the advent of electronic distance measuring instruments, surveyors used tapes made of an alloy called "invar," to measure base lines.
High resolution available. (386.9 kb, 1388x888).
