Regulating beaker stand

REGULATING BEAKER STAND CARL E. MARTINSON Lehigh University, Bethlehem, Pennsylvania

THE device is very useful in quantitative analysis determinations which require filtering through Witt filters into beakers of different sizes, where loss of filtrate, due to dropping from the funnel-end and splashing, jeopardizes the reliability of results. It is made so that it can fit inside a standard Witt filter flask. Any size beaker which ordinarily fits in a Witt filter flask can be used with this device. If a determination requires filtering into a small beaker, the plate A , on which the beaker rests, may be raised by pressing upward on a metal strip B, which releases the spring C from the rods on which it presses. When the metal strip is released, the weight of the beaker plus the tensile strength of the spring prevents the movable plate from sliding. To lower the plate, the same procedure

may be followed. The apparatus is made of a resistive metal: brass, for instance, except the spring, which is made of spring steel. The two rods on which the spring presses, and the two guiding rods are threaded a t one end and screwed into tapped holes in the bottom plate. I

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