28. Model of McCormick Reaper, 1845. USNM 124615; 1933. Scale model of the reaper patented by Cyrus H. McCormick on January 31, 1845. Roderick Davis constructed the model from the specifications of United States patent 3895. Gift of McCormick Historical Association, Chicago, Illinois. 29. Model of McCormick Reaper, 1847. USNM 124615; 1933. Cyrus McCormick patented this reaper on October 23, 1847. Roderick Davis built the model from specifications of United States patent 5335. Gift of McCormick Historical Association, Chicago, Illinois. 30. Wheeled Plow, 1769. USNM 127755; 1934. Wheeled plow made by Matthew Thumb in 1769 at Palatine, New York, for Henry Kloch. It has an almost flat, wooden moldboard; wrought-iron share and colter; a two-wheel truck in front for the beam; and one handle. The large wheel ran in the furrow and the small wheel on the land. The wooden parts of the hitch and the draft chain have been restored. The plow is probably a copy of a German one. Gift of Sir Henry Solomon Wellcome, London, England. 31. Model of Grain Separator, 1875. USNM 129836; 1934. Working model of a grain separator for a threshing machine made by Daniel Garver. The model represents inventions covered by three patents issued to Daniel and Cyrus Garver: the grain separator, patent 114546, issued May 9, 1871; the fan blast regulator, patent 114547, issued May 9, 1871; and the bag holding device, patent 161501, issued March 30, 1875. Loaned by Miss Melchora Garver, Hagerstown, Maryland. 32. Waldron Cradle Blade and Snead, about 1840. USNM 129789; 1934. The blade has holes for attaching the cradle. The wooden frame, or snead, supports the cradle fingers, now missing. Gift of Sydney S. Stabler, Washington, D. C. 33. Settling Can Cream Separator, about 1890. USNM 129789; 1934. Cooley brand creamer, used for separating milk from cream prior to churning. The milk and cream were set in a cool place for several hours while the cream rose to the top. The farmer drew skim milk off through a spigot at the bottom, after which the cream could be drawn off. Used on farms before the hand centrifugal separator came into wide use. By 1890, in butter-producing areas, the centrifugal separator had already caused the disuse of the Cooley and similar separators. Gift of Sidney S. Stabler, Washington, D. C. 34. Wooden Hayfork, about 1879. USNM 137459; 1936. Hayfork of second-growth white oak, made by John Heiss, Lima Township, Lagrange County, Indiana. It was used for feeding stock and for handling clover and short straw of all kinds. Gift of E. W. Heiss, Washington, D. C. 35. Wooden Measure, 1845 or earlier. USNM 137960; 1936. Small, round wooden measure used in 1845 by William Heiss, Lagrange County, Indiana, to feed small grain or mill feed to livestock. William Heiss was a grandfather of the donor, E. W. Heiss of Washington, D. C.