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This device is intended to keep the contents of an ordinary blood-counting pipette from flowing out of either end, while being carried in the apparatus case. It was designed to take the place of the ordinary rubber band commonly used for this purpose. It consists of a piece of hollow rubber tubing of sufficient caliber and length, closed at both ends with solid rubber plugs which are vulcanized to the rubber tubing. The' tubing between the plugs is cut in halves longitudinally, thus allowing the insertion of the pipette. Its advantage is that it does not admit of the pipette being forced through the ends of the rubber by reason of the tension thereof, thus allowing the escape of the contents of the pipette, as may happen with the simple rubber band.
405 Marlborough Street.
SEYMOUR M. A STOPPER FOR BLOOD-COUNTING PIPETTES. JAMA. 1910;LIV(6):467. doi:10.1001/jama.1910.92550320009002p