Dear Martin, I don't know the roller-pulley system you described but can't tell from the photo if these people were using another non-grid finding aid. The Library of Congress describes a 1992 *Champion map of Buffalo and Niagara Falls, New York* as a wall map designed for use with radial index tape-measure. https://lccn.loc.gov/93685367 Positioning the the tape in specific directions helped people find locations a specific distance from the center/centre. For some, this was easier to use than the alpha-numeric grid system employed by some map companies. John Stevenson On Tue, Aug 29, 2017 at 4:40 AM, martin dodge <[log in to unmask]> wrote: > > > Hello > I am interested if anyone on the list remembers city centre tourist maps, > displayed on large poster boards in public places from the 1950s/60s era. > > A colleague mentioned that he remembers them in Manchester and they > included some kind of roller-pulley system that allowed people to move a > selection pointer around on the map. > > I think the attached photograph might be showing what this kind of map but > its not very clear. Its also online at > http://www.gmlives.org.uk/imu/request.php?request=Multimedia > &method=fetch&key=4869 > > > Any information gratefully received. > > many thanks > Martin Dodge > > > --- > > Department of Geography > University of Manchester > Oxford Rd > Manchester, M13 9PL > UK -- John A. Stevenson Associate Librarian and Interim Head, Multimedia Collections and Services Department University of Delaware Library 181 S. College Ave. Newark, DE 19717-5267 302 831-8671 [log in to unmask] <[log in to unmask]>