cury. It is then inverted while it is kept termine the direction of the origin of the sound. It closed by the finger. The end of the tube is placed be- extended beyond the *4, inch limit. The beginning of therefore becomes a simple task to draw two lines low a body of mercury in a suitable vessel… … It is perhaps unnecessary to caution the maker of SCALE AND MERCURIAL bell continuously as long as the current is maintained, the barometer to conduct the various operations of INDICATOR. BAROMETER, causing it to sound forth like a great organ pipe, but filling and adjusting above a large platter…
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