nd is contained in ENTIFIC AMERICAN upon this disagreeable task ; cer— the frame H. The small tainly every one who uses them knows full well the counter balances on the right truthfulness of our statement. The lamp herewith of the engraving are merely illustrated differs materially from others… … necessary in its construction. In place thereof the tube, A, is formed with two spiral grooves, B, op- posite each other, said grooves being received by the vibrations of the mercury chamber. short pins inside of the collar; these pins are sta- tionary, and act asa nut; for when the burner and cury…
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