Index: trunk/src/org/openstreetmap/josm/data/projection/Ellipsoid.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/Ellipsoid.java	(revision 8254)
+++ trunk/src/org/openstreetmap/josm/data/projection/Ellipsoid.java	(revision 8255)
@@ -14,4 +14,9 @@
  */
 public final class Ellipsoid {
+
+    /**
+     * Clarke 1866 ellipsoid
+     */
+    public static final Ellipsoid clarke1866 = Ellipsoid.create_a_b(6378206.4, 6356583.8);
 
     /**
Index: trunk/src/org/openstreetmap/josm/data/projection/Projections.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/Projections.java	(revision 8254)
+++ trunk/src/org/openstreetmap/josm/data/projection/Projections.java	(revision 8255)
@@ -74,4 +74,5 @@
         registerBaseProjection("tmerc", TransverseMercator.class, "core");
 
+        ellipsoids.put("clrk66", Ellipsoid.clarke1866);
         ellipsoids.put("clarkeIGN", Ellipsoid.clarkeIGN);
         ellipsoids.put("intl", Ellipsoid.hayford);