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Actually, I think Francis explained it fairly well. These types of bar
(graphic) scales are, in fact, illustrated in basic mapping books,
including the smaller divisions to the left of zero. One such book,
around for a long time, is David Greenhood's _Mapping_ (revised edition
of Down to Earth: Mapping for Everybody) and available in paperback
from the 1964 issue from the Univ. of Chicago Press:. You can actually
pull up a an illustration of this type of bar scale in Google Books,
including the illustration, by searching "graphic scale" and then
clicking on p. 44.
Joel Kovarsky
Vladimiro Valerio wrote:
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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: [email protected] [mailto:[email protected]] On
Behalf Of Kim H. Edwin
Sent: 25 August 2009 17:48
To: [email protected]
Subject: [MapHist] Bar Scale Data ?
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