is entire ; the back has two little windows , and each side has two or three or even four , through which the heat passes into the scorifiers and melts the ore . In place of little windows , some muffles have small holes , ten in the back and more on each side . Moreover , in the back below the… … A — Broad little windows of muffle . B — Narrow ones . C — Openings in the BACK THEREOF . The crucibles differ in the materials from which they are made , because they are made of either clay or ashes ; and those of clay , which we also call “ earthen, ” differ in shape and size . Some are made in…
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![An illustration from Athanasii Kircheri e Soc. Jesu Mundus subterraneus : in XII libros digestus; quo divinum subterrestris mundi opificium, mira ergasteriorum naturae in eo distributio, verbo Pantamorphon [Greek work romanized] Protei regnum, universae denique naturae majestas & divitiae summa rerum varietate exponuntur, abditorum effectuum causae acri indagine inquisitae demonstrantur, cognitae per artis & naturae conjugium ad humanae vitae necessarium usum vario experimentorum apparatu, necnon novo modo & ratione applicantur (1678)](https://img.insideoutlibrary.com/img/200/ia-gri_33125012893901-373-0.webp)
