NEW CLOCK.
We were shown by Messrs. Newman an ingenious clock recently in- troduced, and called an "atmospheric clock." This clock is in appear- ance like a long thermometer, without, however the bulb of mercury at the bottom. It has a glass tube about three-eighths of an inch in diameter, and the length of the thormometer-like frame; this tube is secured to the frame by two bands, through which the tube easily slides. Inside of this glass tube is another and smaller glass tube, at each end of which is a portion of mercury and a scrap of blotting paper or other ab- sorbent material, for the purpose of absorbing any damp which might find its way into the tube. About an inch and a half from each end of the inner tube is a small throat, through which the mercury has to pass. On each side of the glass tube are the divisions of time ; the mercury in the top end of the tube is placed opposite the proper time, and it descends to the bottom of the tube exactly as the time lapses. When the mer- cury has reached the bottom of the tube, the frame can be turned, and the mercury set to the same time on the other aide; and so the time is -continually indicated. It a sort of perpetual hour-glass.
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