. Machinery and processes of the industrial arts, and apparatus of the exact sciences. y to the wool great heat, in whatever manner applied, was found to have theeffect of hardening the fibres, making them cohere, and giving them atinge of a yellowish brown color, which was variable in intensity accord-ing as the material had been a longer or shorter time in contact withthe fatty matters removed. The mere volatilization of the bisulphidewas effected without difficulty. It sufficed for this to introduce into thevessel containing the material to be operated on, either boiling water or
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. y to the wool great heat, in whatever manner applied, was found to have theeffect of hardening the fibres, making them cohere, and giving them atinge of a yellowish brown color, which was variable in intensity accord-ing as the material had been a longer or shorter time in contact withthe fatty matters removed. The mere volatilization of the bisulphidewas effected without difficulty. It sufficed for this to introduce into thevessel containing the material to be operated on, either boiling water orsteam; but the injurious effects above described invariably Moison discovered at length that with proper arrangements a cur-rent of air heated to a temperature considerably below that of boilingwater, 70° or 80° C=160° to 175° F., would remove the liquid entirely,and leave the fibre of the wool wholly uninjured. The apparatus em-ployed in conducting this process is shown in the Fig. 80 annexed. Thewool to be subjected to the operation is introduced into a cast-iron. Moisons apparatus for removing oil from wool. cylinder, A, surroundedby a jacket into which steam maybe conductedwhen it is necessary to raise the temperature. One hundred kilograms,say two hundred and fourteen pounds, of wool are placed in thiscylinder at once. There is within the cylinder a false bottom perforatedwith numerous holes, with a small free space beneath it. Upon the topof the wool is placed a circular follower or compresser. fitting the inte-rior of the cylinder, and perforated also with holes like the false rods connected with this follower pass through stuffing boxes inthe lid, and may be driven downward by means of fixed screw-nuts, therods having screw-threads cut upon their prolongations above the cylin-der. The object of this arrangement is to compress the wool to a cer REMOVAL OF OIL FROM WOOL. 319 tain extent, since the success of the operation is always most satis
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