Having looked at the Robert Greenyer video https://www.youtube.com/watch?v=xyp14fnE1jQ and his observation of the "wavy" nature of a commercial heater and the Lugana hotcat :
http://lenr.qumbu.com/web_hotcat_pics/141030_blackbody_04.png Greenyer notes the wavy structure of an electric heating element wound round a ceramic tube, and thinks that this explains the irregular structure of the Lugano hotcat: it's most likely alumina cement over an inner alumina cylinder. I now think this is the most likely construction (sorry for the 300dpi scans) : http://lenr.qumbu.com/web_hotcat_pics/hotcat_141030_fig20.png and (as usual) the banding could be explained in multiple ways : http://lenr.qumbu.com/web_hotcat_pics/hotcat_141030_fig21.png Only the "shadow" hypothesis requires the ceramic to be visually transparent -- the other two just could depend on thermal conductivity. Updated paper's at : http://lenr.qumbu.com/rossi_hotcat_oct2014_banding_d.php ps : It's now obvious that the hotcat's unusual shape -- particularly the 2013 versions with the flange -- are intended as plug-in replacements for new or existing commercial heating systems, which also operate in the 1300-1400C range. Huge market.
