Manufacturer and builder 5, 1892
In a recent judicial decision relating to the secondary battery, the words "paint," "paste" or "cement" were used to define the different methods by which the active could be applied to an electrode of lead. Can you define the specific differences between thew modes of application?
- F. W. C., Philadelphia.
Answer.
Not having access to the text of the decision, or to the record of the case, it is difficult to understand the specific distinctions which the judge wished to emphasize. The common sense distinctions, it appears to us, would be as follows: Where the material is mixed with a liquid vehicle (water, with or without an agglutinant etc.,) in such condition that it may be applied with a brush as a paint is applied, the case would be that of a paint: where same or other mixture is made up so stiff that it cannot be applied with a brush, but would require to be said on with a spatula, after the manner of spreading mortar with a trowel, that would represent the ease of a paste; and when the admixture is of such a nature that it will "set" and become more or less hard after its application, by reason of certain chemical changes taking place in the mixture, that would represent the case of a cement. The above views are offered with reservation, and an inspection of the record of the case, might disclose facts that would require them to be materially modified.
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