An Apparatus for Illustrating the Apparent Motions of the Sun and Moon relative to the Observer's Visible Portion of the Earth's Surface.

摘要

10,687. Thomas, C. O., W. May 9. Astronomy, teaching; globes.-Relates to apparatus for illustrating the apparent path of the sun in the heavens. A disc A, representing the visible part of the earth's surface at any point, is pivoted diametrally in an upright C. A ring G is similarly pivoted in uprights I. A semicircular scale D to set off the meridian is fixed to the disc A and slides in a slot at the upper end of the upright C. The hour is set by a pointer E attached to C against a scale F. The days and months are marked on the scale G.