The washing of a large number of beakers at frequent intervals in the process of routine analyses is facilitated by the construction and use of a special brush devised in the following manner. Three test-tube brushes are secured and the handles cut off approximately one inch above the bristles. These three brushes are then fastened with piano wire at intervals of 120° about the end of a heavy rubber hose 10 millimeters in diameter of any convenient length. The end of the hose is so placed that it is within one inch of the ends of the brushes. The hose...
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