To K.D. Meek, re identifying and dating surveying
instruments...

Check

1.  Samuel Guye.  Time and Space.  Measuring Instruments
from the 15th to the 19th century (New York, 1971)

2.  Charles E. Smart.  The Markers of Surveying Instruments
in America since 1700.  2 vols. (Troy, 1962-1967)

Also, you might check for a local surveyors group in your
area.

Barbara C. Batson
Exhibitions Coordinator
The Library of Virginia
[log in to unmask]
804-692-3518

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