There is a whole book of USGS topographic symbols (from 1961) available: https://hdl.handle.net/2027/uiug.30112070112047I see "Tel" for telegraph or telephone lines. There's a "T" listed for telegraph office, but that wouldn't make sense in a line like that.--Howdy folks.
I have a client who is trying to figure out what the symbol “T” means on a USGS topographic map (see below). The map is from 1940 and I don’t see any interpretation of it on the USGS key of symbols (https://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf). My suspicion is a transmission or telephone line, but that’s only a guess. Thanks for your help.
David Hodnefield
President
952-253-2004 ext 111
Historical Information Gatherers (HIG)
--Ryan MattkeMap & Geospatial Information LibrarianAdjunct Faculty, MGIS ProgramProject Lead, Big Ten Academic Alliance Geospatial Data ProjectCo-Director, Mapping Prejudice ProjectPhone: 612.624.5757--
Ryan Mattke
Map & Geospatial Information Librarian
Head, John R. Borchert Map Library
Adjunct Faculty, MGIS Program
Phone: 612.624.5757
Web: http://www.lib.umn.edu/borchert
ORCID: http://orcid.org/0000-0001-8816-9289