Abstract
Gibbs1 classifies the drop recorders reported in the literature according to the essential mechanism as follows: (a) impulse, (b) weight, (c) expansion, (d) electrolytic, and (e) displacement. The simple and effective drop recorder here described depends upon a principle quite different from any described heretofore, and resulted because of our trial and abandonment of some of the most promising types, including that described by Gibbs.2The essential part of our form of drop recorder consists of a short length of capillary tubing sealed to a bulb and T tube. A current of air from a pump or compressed air jet flows through the T tube and bulb and out of the capillary tube. The drops to be recorded as they fall from the drop inlet are blown through the capillary tube and momentarily hinder the passage of air sufficiently to create a slight increase of back-pressure that may be used to actuate a tambour or other recording device.The air pressure required is very slight, equivalent to a few centimeters of wat...
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