Scientific American Volume 88 Number 10 (March 1903) . se,immediately broken on the return swing of the pendu-lum, and the parts are allowed to drop back to theirnormal positions. Prom five to eight minutes is re-quired for the weight to reach its lowest position. Inthe ordinary-sized mantel clock, such as that illus-trated, a battery of three dry cells is employed. Theseare placed in a drawer beneath the clockwork, andserve to wind up the clock for a period of about eightmonths without renewing. This system is also appli-cable to clocks with long pendulums, such as the ca-thedral type, the me
Scientific American Volume 88 Number 10 (March 1903) . se,immediately broken on the return swing of the pendu-lum, and the parts are allowed to drop back to theirnormal positions. Prom five to eight minutes is re-quired for the weight to reach its lowest position. Inthe ordinary-sized mantel clock, such as that illus-trated, a battery of three dry cells is employed. Theseare placed in a drawer beneath the clockwork, andserve to wind up the clock for a period of about eightmonths without renewing. This system is also appli-cable to clocks with long pendulums, such as the ca-thedral type, the mechanism being, of course, propor-tionately larger and the magnets and battery morepowerful. considered. Some years ago a writer for the Ency-clopaedia Britannica declared that the telling strokewas downward and forward, and that if it were other-wise, the bird would be pitched a somersault by itsown activity. Prof. Hargrave asserted that a birdswing revolved in a cone and acted as a modified troch-oided plane. Prof. Pettigrew was the first, so far as. SELF-WINDING CLOCK. VIEW SHOWING DETAILS OF WINDING MECHANISM I know, to try tor a self-recorded diagram of a wingin action. For this purpose he used a sphygmograph,but his efforts seem not to have been very Powell caused a small bir* to fly through aI- 2. Jscientific-american-1903-03-07
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