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On 2018-06-01 16:30, David C wrote:
 > I have attached a (poorly) scanned paged from US Coast and Geodetic
Survey Special publication No 197  "Practical Air Navigation and the use
of the Aeronautical charts of the US Coast Guard and Geodetic Survey"
1938 edition.

The whole document is available (in three different editions) at the
NOAA digital document collection.

https://library.noaa.gov/Collections/Digital-Docs

Look in the Coast & Geodetic Survey special publications section of that
page. The access is not friendly, as the drop down menu gives only the
publication number and year. However, a "finding aid" link takes you to
a PDF document which lists the special publications in numerical order,
with title, author, and year. It is a mystery to me why the finding aid
isn't an HTML page with links to the applicable documents.

Perhaps of interest to the navigation minded are the publications on
geodetic astronomy and determination of latitude, longitude, and
azimuth. However, the techniques require specialized equipment.

Also interesting are the "Triangulation in ..." publications for your
area of the nation. These list and describe the triangulation marks,
including instructions on how to reach them. Quite often the
instructions mention old roads and structures long gone. They're a trip
back to a bygone era. Many old marks still exist, though some have
succumbed to construction, vandals, and souvenir hunters. A few years
ago I spent half an hour hiking up a desert butte to visit a first order
triangulation station from the 1920s. Unfortunately, after all that work
I found the bronze station mark battered and unreadable.

   

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