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Keuffel & Esser theodolite prototype
One of a kind.
K&E in
1946 builds first 10 second optically read theodolite prototype for
US Army Engineer
Corps, but not put into production, only one made
and not marked or serial numbered.
Glass
circles in degrees
are read directly with micrometer to 10 seconds
of arc. Height 9 inches.
Weight 12 lbs.