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You can 'snow' a Torbal balance with pigment, abrasive dust, chemicals, or any powder
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cannot be affected by foreign material. The balance will not become sluggish, it retains its initial accuracy and sensi tivity, and because of its virtually one-piece construction, adjustment is permanent. The Torbal DWL2 shown above is a 120-gram capacity balance with a dial accuracy of 5 mg.; silicon fluid damping for fast weighing; dials with 9 g χ 1 g, and 1 g x 0.01 g graduations, to eliminate use of small loose weights. Write today for literature. The Torsion Balance Company Department A Main Office and Factory: Clifton, N. J., Sales Offices: Birmingham, Ala.; Chicago, 111.; San Mateo, Cal.; Pittsburgh, Pa.; Plants and Offices in Montreal, Quebec; London, England and Waterford, Ireland
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Sometimes you can't help it. In certain weighing situations no matter how hard you try, a balance gets dirty from spilled or overflowing powders. Or from dust in the air. When this happens on a conventional knife-edge balance, the knife-edge ful crum becomes dirty—gets gummed up, and eventually wears. Increased fric tion, decreased sensitivity and inac curacy result. (In time even small amounts of dirt in the atmosphere will have this effect.) On the other hand, with a Torsion Balance based on fulcra which twist instead of roll, this cannot happen. There are no friction pivots or knifeedge fulcrum; thus no metal-to-metal wear, and the weighing mechanism
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ANALYTICAL CHEMISTRY, VOL. 4 2 , NO. 5, APRIL 1 9 7 0
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