Page 3 Advertisements Column 1

Patea Mail, Volume VIII, Issue 978, 2 January 1883, Page 3

The American Watch Company, of Waltham, has forwarded to the headquarters of the United States Signal Service Bureau —at Washington—a novel clock for the use of the service. The case is made of brass, of sufficient height to allow the swing of a pendulum one metre in length. The case is made perfectly air-tight, and has been constructed in such a manner that the air can be exhausted and the movement run in a vacuum, thus avoiding the variations incidental to atmospheric changes. A very ingenious electrical attachment has been affixed'to the movement, whereby the clock is wound as it runs, thus overcoming the variations usual when the mainspring is fully wound or partly .spent. The manner in which this is accomplished is by alternately breaking and closing an electric circuit, and-using the motion thus obtained, and the power of the electrical current in rewinding the spring by means of a worm and other mechanism, which is so graduated as to motion that the winding keeps exact pace with the running. The slightest variation from this is shown on a delicate indicator attached thereto, ]