4 messages on the Magnetic Declination question.---------Johnnie
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Tue Nov 16 11:12:07 EST 1993
Re: Magnetic Declination
For Cincinnati magnetic declination in 1900, we have a catalog record for
"Distribution of the magnetic declination in the U.S. in 1900," compiled by
Henry Gannett, from the 17th Annual Report of the USGS, part 1, pl. 2, 1899.
Col. map, scale 1"=110 miles.
N. Kandoian
NYPL Map Div.
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Tue, 16 Nov 1993 12:13 EST
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Re: Magnetic Declination
David,
The topos of scale 62,500 were printed about that time and show the
declination. I have the ones for Cincinnati for 1912 and they show
"approximate mean declination 1912 of 3/4degrees. There si also an 1898
edition according to Moffat but I do not have it. Hope this helps.
Evron Collins
Bowling green State University
Bowling Green, OH
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Tue, 16 Nov 1993 11:53:00 -0500 (EST)
"Jim Minton (615) 974-4315, X3878" <[log in to unmask]>
RE: Magnetic Declination
Cobb & MAPS-L:
A quick search of the USGS - ESDD (Earth Science Data Directory)
via the INTERNET GOPHER/WAIS yielded the following:
NATIONAL GEOPHYSICAL DATA CENTER
NOAA E/GC1
325 BROADWAY
BOULDER, CO 80303
ATTN: W. MINOR DAVIS (? DATED INFORMATION ?)
(303) 497-6478
They maintain a file of 200,000 compass declinations at worldwide
locations, mostly on land, since 1900. Retreival is by state,
county, geographic area or complete file. Data are available on
digital tape, diskette, or in selected listings.
I haven't search the GOPHER further but would imagine this is
available out there somewhere online through the GO or a WAIS.
David, Why don't you track that down or if you call them ask if
they have this available somewhere via the GO.
Jim Minton
University of Tennessee-Knoxville
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16 Nov 93 14:52:04 CST
Re: Magnetic Declination
> Can anyone suggest a source (or map?) where one might determine the magnetic
> declination for the region of Cincinnati,Ohio ca. 1900? Thank you.
>
> David A. Cobb
> Harvard Map Collection
David,
According to the USC&GS, the Cincinnati Observatory (39:08, 84:25)
registered 1:09.0 E in 1903.3 and 1:06 reduced to 1905.0. The 1905
declination for Cincinnati University was 1:02. Seems to be more
spatial than temporal variation.
Chris Baruth
AGS Collection
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