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Very good, Francis, It is just whst I too suspected but, a great BUT,
Kin Edwin wrote: "This interval to the left of 0 is also the same
distance as those intervals on the right side of the 0."
This description doesn't apply to your (my) hypothesis.
May Kim send us an image?
vladimiro
Il giorno 25/ago/09, alle ore 20:00, Francis Herbert ha scritto:
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I suspect that you are describing a fairly common feature of many
graphic map scale-bars in whatever measures. The extending of the
bar to
the left of the '0' is usually made to supply more detailed
marked/ticked sub-divisions to those fewer and general ticked scale-
bar
divisions to the right (and/or vice-versa). Thus, if the left-hand
extension is in individual unit ticks of 1 (up to 10) miles it
facilitates the calculation of 'abnormal' mileage distances - such as
even-numbered 12 or 16 miles - when combined by reading off the
right-hand generalized distances (if, e.g., they are multiples of
odd-numbered 5-mile unit ticks). Not so easy to explain over the
internet; but find a text book or manual on map-reading - or even Ed
Redmond . . .:)
Francis Herbert (former curator of maps somewhere)
-----Original Message-----
From: maphist-boun...@geo.uu.nl [mailto:maphist-boun...@geo.uu.nl] On
Behalf Of Kim H. Edwin
Sent: 25 August 2009 17:48
To: maphist@geo.uu.nl
Subject: [MapHist] Bar Scale Data ?
Dear Mapsters,
While working on some Pictorial Maps, I found a couple from the 1940's
which have bar scales extended left of the traditional 0 distance.
This
interval to the left of 0 is also the same distance as those intervals
on the right side of the 0.
Would someone please let me know what this is called and why it is
done?
Kim Edwin, Library Technician
Library of Congress, Geography & Map Division
202-707-6277
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