diff --git a/example/non_base_dimension.cpp b/example/non_base_dimension.cpp
new file mode 100644
index 0000000..4476a34
--- /dev/null
+++ b/example/non_base_dimension.cpp
@@ -0,0 +1,78 @@
+// Boost.Units - A C++ library for zero-overhead dimensional analysis and 
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2007-2008 Steven Watanabe
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+/** 
+\file
+    
+\brief non_base_dimension.cpp
+
+\details
+Another example of user-defined units with conversions.
+
+Output:
+@verbatim
+
+//[non_base_dimension_output
+//]
+
+@endverbatim
+**/
+
+#include <iostream>
+
+#include <boost/units/io.hpp>
+#include <boost/units/conversion.hpp>
+#include <boost/units/unit.hpp>
+#include <boost/units/quantity.hpp>
+#include <boost/units/physical_dimensions.hpp>
+#include <boost/units/base_unit.hpp>
+#include <boost/units/make_system.hpp>
+
+namespace boost {
+
+namespace units {
+
+//[non_base_dimension_snippet_1
+
+struct imperial_gallon_tag :
+    base_unit<imperial_gallon_tag, volume_dimension, 1> { };
+
+typedef make_system<imperial_gallon_tag>::type imperial;
+
+typedef unit<volume_dimension,imperial> imperial_gallon;
+
+struct us_gallon_tag : base_unit<us_gallon_tag, volume_dimension, 2> { };
+
+typedef make_system<us_gallon_tag>::type us;
+
+typedef unit<volume_dimension,us> us_gallon;
+
+//]
+
+} // namespace units
+
+} // namespace boost
+
+BOOST_UNITS_DEFINE_CONVERSION_FACTOR(boost::units::imperial_gallon_tag,
+                                     boost::units::us_gallon_tag,
+                                     double, 1.2009499255);
+
+using namespace boost::units;
+
+int main(void)
+{
+    quantity<imperial_gallon>   ig1(1.0*imperial_gallon());
+    quantity<us_gallon>         ug1(1.0*us_gallon());
+    
+    quantity<imperial_gallon>   ig2(ug1);
+    quantity<us_gallon>         ug2(ig1);
+    
+    return 0;
+}