Page:The Art of Distillation, 1651.djvu/27

 Book.1.Of the Art of Ditillation. 3 which happens not in a Furnace of another figure, as four quare or triangular, for the corners dipere and eparate the force of the fire. Their magnitude mut be uch as hall be fit for the receiving of the veel; their thicknes o great as neceity hall eem to require; only thus much oberve, that if they be made of forged Iron or Copper, they mut be coated within ide, epecially if you intend to ue them for a trong fire. They mut be made with two bottomes ditinguiht as it were into two forges, the one below which may receive the ahes, the other above to contain the fire. The bottom of this upper mut either be an Iron grate, or ele an Iron plate perforated with many holes, that o the ahes may the more eaily fall down into the bottom, which otherwie would put out the fire. Yet ome Furnaces have three partitions, as the Furnace for Reverberation, and the Regiter Furnace. In the firt and lowet the ahes are received. In the econd the fire is put, and in the third of the Furnace for Reverberation the matter which is to be reverberated. This third ought to have a emicircular Cover, that o the heat may be reflected upon the contained matter. The bottom of the third and uppermot partition of the Regiter Furnace mut be either a plate of Iron, or a mooth tone perforated with hole, having topples of tones fitted thereunto, which you may take out or put in, as you would have the heat increaed or decreaed. In the top or upper part of all thee Furnaces where it hall eem mot fit, there mut be two or three holes made, that by them the moak may more freely pas out, & the air let in to make the fire burn the tronger if need require, or ele which are to be hut with topples made fit to them. The mouths of the forementioned partitions mut have hutter, jut like an Ovens-mouth, with which you may hut them cloe, or leave them open if you would have the fire burn tronger. But in defect of a Furnace, or fit matter to make one, we may ue a Kettle or a Pot et upon a Trefoot, as we hall how when we come to give you a decription of the Furnace and Veels. The truth is, a good Artit will make any hift, yea and in half a dayes time make a Furnace or omething equivalent to it for any operations. B 2CHAP.