Tom  Patterson's more recent map of the Grand Canyon South Rim has a similar approach, using a 'magnifier' lens for the central section: (back side-page 2)
https://www.nps.gov/grca/learn/news/upload/sr-pocket-map.pdf

Roger Wheate, UNBC

On 2018-08-02 11:40 AM, Angela R Cope wrote:

Attached are two images of the Baltimore map showing the scale statement and the map itself.


Using variant scales from city center to outskirts allows the map to show detail in the middle and wide coverage at the perifery. This is the kind of thing I'm thinking of, though the other examples are interesting.


Angie


________________________________
From: Maps-L: Map Librarians, etc. <[log in to unmask]><mailto:[log in to unmask]> on behalf of Craig Haggit <[log in to unmask]><mailto:[log in to unmask]>
Sent: Thursday, August 2, 2018 1:07 PM
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Subject: Re: [MAPS-L] Scale varies on one map

The one I'm most familiar with are oblique world maps like the Newsmaps from World War II (Target Tokyo<https://www.davidrumsey.com/luna/servlet/s/539v5d> in the David Rumsey map collection, scale along the bottom). Can't think of a specific non-world map for this however.

Craig

Craig Haggit
Senior Catalog Librarian, Western History and Genealogy Dept.
Denver Public Library
10 West 14th Ave. Parkway
Denver, CO  80204
720-865-1813
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On Thu, Aug 2, 2018 at 9:24 AM Angela R Cope <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Will anyone share examples of maps that depict variable scale across a single map? I have one - Baltimore by Horn-Shafer Co. and Baltimore Area Convention and Visitors Council 1967 (oclc 30570294)

But I know there are many European cities that depict scale in this way.

Cataloger's Desktop definition: A scale designation for a resource whose scale is variable across the resource, when the range of values cannot be determined.

Thanks in advance.

Angie

[https://www.denverlibrary.org/sites/dplorg/files/DPL_horiz_2color.png]