. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. st impossible to avoid. Thischance of defects together with the labor involved makes theprocess undesirable. iSucked-On Filter. In August a suggestion came from , inc., to mold or form a fiber filter jacket on theoutside of a fine screen frame by suction from a water pulpsolution. They also suggested cotton-seed hull fiber as avery promising material for this form of filter» The firstfilters based on this idea were made by holding and rotatingthe screen frame by hand
. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. st impossible to avoid. Thischance of defects together with the labor involved makes theprocess undesirable. iSucked-On Filter. In August a suggestion came from , inc., to mold or form a fiber filter jacket on theoutside of a fine screen frame by suction from a water pulpsolution. They also suggested cotton-seed hull fiber as avery promising material for this form of filter» The firstfilters based on this idea were made by holding and rotatingthe screen frame by hand in a tub containing the solution,suction being applied by means of a hose leading from a in October, a simple machine was installed by means ofwhich better control could be secured of such functions asrotation speed, depth of immersioii, concentration or solution,suction, pressure, etc. Vi/ith this machine the problem wasstudied until the last of iiovember, making filters in the formof a cup which could be slipped over the 1919 lA^ar gas con-tainer and sealed to it St the -upper edge. ..Attention was.
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