ntical results. Only very strong acids had less effect than dilute ones, which volume of sound and current at the transmitting end BY J. J. HUMMEL AND H. R. PROCTER. of the line. again have less action than pure water. Similar results In applying basic coal tar colors to cotton, it is well This… … strong than that of boiling water, but at very elevated before proceeding to the dyeing operation. NORIEGA'S TELEPHONE. By adopting this simple precaution, the dye liquors temperatures its vapors produce a more marked effect. are maintained in a perfectly clear condition, and Dry carbonic acid does…
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