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No-one has mentioned Geochron lighted maps (World Time Indicators) which I
suspect is what was intended. They sell in the thousands of dollars. The
clockwork machinery inside generates a sine-wave shade behind a lit mercator
map. The shade changes shape over the course of the year to reflect the angle
of the sun.
 
Their contact in the 1994-5 IMTA directory is:
 
Geochron Enterprises, Inc
899 Arguello St
Redwood City, CA 94063
415-361-1771 * Fax 415-361-1780
 
 
Hope this helps.
 
Nat Case
Hedberg Maps
White River Jct, VT