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In the front part of each cadinhe there is a rectangular aperture that gives access to the bottom of the crucible and facilitates the removal of the bloom therefrom. At the back part there is a small aperture for the introduction of the tuyere, and which permits, besides, of the nozzle of the latter being easily got at so as to see whether the blast is working properly.
To protect the nozzle of the air-pipe as it entered the furnace against the action of the intense heat to which it was subjected, a spiral pipe for a stream of cold water constantly to play in has been introduced within the sides of the iron tuyere through which the nozzle passes; by which means the tuyere is kept comparatively cool, while the nozzle of the air-pipe is effectually protected.
This arrangement prevents the tuyere from getting befouled by scoriae during the operation of the furnace and thus interfering with the wind. Tromp.
Thomas' Hospital, who has made a collection of woods named in the Scriptures, has managed to secure a specimen of thyine, which a friend of his obtained on the Atlas Mountains. It resembles the woods which we know as tuyere and amboyna.
In British patent 2321 Bessemer proposed to convert his steel in crucibles, arranged in a suitable furnace and each having a vertical tuyère, through which air under pressure was forced through the molten metal.
The tuyere, which is fitted to a wooden conduit of square section that runs along the back of the masonry, is placed in the axis of the cadinhes and enters the masonry at a few centimeters from the bottom in such away that its nozzle comes just flush with the surface of the refractory lining.
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