Stránka:roll 1916.djvu/234

3X0 Woodcraft Manual for Girls An Indian Clock, Shadow Clock, or Sundial To make an Indian shadt)w clock, or sundial, prepare a smooth board about fifteen inches across, with a circle divided by twenty- four rays into equal parts. Place it on a level, solid post or stump in the open. At night set the dial so that the twelve o'clock line points ex- actly north, as deter- mined by the Pole Star and nail it down. Then, fix a stick or pointer with its upper edge on the ;ntre and set it exa. . :/ pointing to the Pole Star (a b); that is, the same angle as the latitude of the place, and fix it there immovably; it may be necessary to cut a notch (c) in the board to permit of a sight line. The hours eig^t at ni^t to four next morning may as well be painted black. As a time- piece, this shadow clock will be found roughly correct.* The Indians of course used merely the shadow of a tree, or the sun streak that fell on the lodge floor through the smoke opening. The Watch as a Compass In case one desires to locate north and has no compass, a watch may be used. Point the hour hand to the sun. In the morning, halfway be- tween the outside end of the hour hand and noon is due south; in the afternoon, one must reckon halfway backward; for instance, at 8 A. M., point the hour hand to the sun and find the place half- way to noon. It will be at lo, which is due south. At 4 o'clock, pomt the hour hand at the sun and reckon halfway, and the south will be found at 2 o'clock. The reason "halfway" is used is that, while the sun makes a !To mak* s mow fdeatificaUy accan4« Svndid, Me CoUint,