CROSS SECTION of HEAT RETENTIVE PLATE
CROSS SECTION OF A HEAT RETENTIVE PLATE (Click to enlarge)
http://doiop.com/hrpphotos
after you click the link you can right click the picture to see it from different angles and lights, you can even see a transparent picture.
Anybody can make a plate with a groove, a heater which is a simple mix of clay with iron filings and a ceramic base.
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