Dryers to heat

Spirek ovens or called cupola furnaces; They were cooking cinnabar to eight hundred degrees centigrade. In the bottom of the oven where the heat was greater, cinnabar he roasted freed the mercury in the vapor state, which, thanks to the vacuum cleaners, was conveyed to the condensation channels, continuously refrigerated. From here, it dripped in tanks in hydraulic closure, in which it is mixed deposited at all the products of combustion.