-------- Original Message --------
Subject: [Fwd: Re: 1930ish US Coast & Geodetic Survey charts]
Date: Fri, 05 Jun 2009 13:32:01 -0400
From: Joel Kovarsky <[log in to unmask]>
To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]>
I am forwarding this continued conversation to Maps-L, with John Cloud's
permission. The html images associated with these messages will not post
to the list, so only the text will show. Also, he had a short note re:
the issue of the dates in the compass rose:
"I told you it got ugly! Go ahead and forward anything you want.
One tip though: Re: "and a date in the magnetic declination device
on the map (usually just the year, often later than the edition
dates in the lower margin)"
At the time a "new" edition of a chart comes out, whatever magnetic
variation is shown on the compass rose, if its correct to the time
the plate is completed, will soon be obsolete because of the small
changes (secular variations) in declination. So often the compass
rose variation would be set forward into the future a bit. Hence,
here are crops from the chart for Nantucket harbor, "published" in
1889, with the compass rose set for the variation of 1890-- and
then, for at least this specimen, "printed" in 1891.
Good luck cataloging something like this! "
Joel Kovarsky
-------- Original Message --------
Subject: Re: 1930ish US Coast & Geodetic Survey charts
Date: Fri, 05 Jun 2009 12:57:24 -0400
From: Joel Kovarsky <[log in to unmask]>
To: John Cloud <[log in to unmask]>
CC: Edward James Redmond <[log in to unmask]>
References: <[log in to unmask]>
<[log in to unmask]> <[log in to unmask]>
John,
Thanks for taking the time. These charts are all from about 1930-1945,
of Virginia bays and rivers. The entries you note in your image are
similar, except ours have small numbers where your large ones show (i.e.
the 15, 16, and 17) . Since I have to catalog these, I'll just enter a
note for the notations as they appear, and leave it at that. The dates
for the charts themselves seem to get quite confusing, since there is
the current edition date, the original edition date, a date stamped in
the lower margin (usually right side), and a date in the magnetic
declination device on the map (usually just the year, often later than
the edition dates in the lower margin).
It's OK if I remain a bit confused. Also, John, if you do not mind, I
will forward all this to Maps-L.
Best, Joel
John Cloud wrote:
> Folks:
>
> I'm not sure what kind of Coast and geodetic Survey charts were being
> referred to in the first place, so...
>
> Beyond that-- it gets ugly. Generally if there's a 20th century year,
> that refers to the year that chart was published. And then there are
> successive corrections to the same yearly edition, as Ed noted. But
> then there's also specific press runs of a chart, which were not
> necessarily synonymous with specific corrections.
>
> The latter is all about the Survey turning to Harris Co. sheet-fed
> offset lithography presses, before World War I. These are STILL used
> (not the same presses, but the last Harris presses ever made) as sheet
> fed presses can run bigger width paper sheets than the largest width
> web-press rolls, plus, unlike, say USGS quad sheets, Survey/NOAA/FAA
> charts were never standardized in shape,-- the sheets are cut to
> whatever rectangular shape is required, so individual press runs of a
> chart really work as a unit, since every one of them will be set up
> and printed together, stacked and cut together, folded together (which
> in and of itself is an amazing industrial art-- the people who set up
> the folding machines for a particular chart are among the most skilled
> people in the whole production process).
>
> But, for example, why these crops from a specific chart of Head of
> Buzzards Bay, Massachusetts, have all those designations-- I haven't a
> clue. If y'all ever find out, let me know!
>
> ------------------------------------------------------------------------
>
>
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>
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--
Joel Kovarsky
The Prime Meridian
1839 Clay Dr., Crozet, VA 22932 USA
Phone: 434-823-5696
Email: [log in to unmask]
Website: http://www.theprimemeridian.com
--
Joel Kovarsky
The Prime Meridian
1839 Clay Dr., Crozet, VA 22932 USA
Phone: 434-823-5696
Email: [log in to unmask]
Website: http://www.theprimemeridian.com
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