Gentlefolk, Suggest a fairly bright monochromatic source if you can find one; index of refraction variations bend different wavelengths by different angles. The light should be some distance from the plume and the shadowboard should be as near as practical. It may help to be able to vary the distances so that you can experiment to find the combination that gives the greatest contrast. During set up, an ordinary blowtorch should make a good stand in for the rocket engine.
--Best, Gerald _______________________________________________ ERPS-list mailing list [EMAIL PROTECTED] http://lists.erps.org/mailman/listinfo/erps-list
