... a stack of the same conical shape, are let into this cavity. The whole is then covered with turf, to prevent the volatile parts from being dissipated, which, by means of a heavy wooden mallet, and a wooden stamper worked separately by two men, is...
Cyclopædia of useful arts & manufactures, ed. by C. Tomlinson. 9 divs - Seite 885
von Cyclopaedia - 1852