Of the Furnace or Keel.
THe Floore or nether part of your furnace must be about thirteen inches wide.
The depth or height thereof must be thirty inches.
The length of it must be about six or seven foot (that is to say) reaching from the fore part of the Oste almost to the further end thereof, so as there be left no more room but as a man may passe between the wall and the end of it.
It must be made wide below, and narrow above, fashioned in outward shape somewhat like to the roof of an house.
It must have three rows of holes at each side, the length of one Brick asunder, and the bignesse of half a Brick, placed checkerwise. Before you begin to make your holes, you should lay two rows of Brick, and when your three ranks of holes are placed upon them, you must lay again over them ano∣ther row of Brick, and upon the same you must place your last and highest course, and they must stand longwise (as it were a tiptoe) the tops of the Bricks meeting together above (the nether part of them resting upon the uppermost course) and note that till then, each side must be built alongst direct∣ly upward.
You should leave almost a foot space between the mouth of your Furnace, and your rows of holes, especially of that row which is nethermost.
The further or hinder end of your Furnace, the which is opposite to the mouth thereof, must be built flat with an up∣right wall, and there must be holes also left as at the sides.
The Furnace in the top, (I mean from the upper course of holes) must be dawbed very well with morter.
And so upon the top of your Furnace there will remain a